Trapped in an escape room with 2 liars

Question

You are in a room, with 6 people. 2 of them are liars. The room has a code pad. The people say:

People	What they say
Keith	The first and last digit are the same number and are not used anywhere else in the code. The numbers in question are prime numbers.
Sabrina	The code does not include any eights or nines.
Cassiopeia	The last four numbers follow the fourth row of Pascal's triangle.
Andrea	There are no odd numbers in the latter half of the code.
Zach	The three digits after the first digit follow the Fibonacci sequence after 1.
Bernard	The five digits of the code before the ninth digit each decreases by 1.

They also say an extra line of dialogue which say:

People	What they say
Keith	Don't trust Cassiopeia.
Sabrina	You can trust Keith.
Cassiopeia	Don't listen to Keith or Sabrina.
Andrea	Don't trust Sabrina, and even Bernard.
Zach	Don't trust Andrea.
Bernard	Trust Zach, but not Andrea.

Who is lying, and what is the code?

Answer 1

First find out who the two liars are:

From their dialogue, we know that either Keith or Cassiopeia is a liar, and that either Andrea or Bernard is a liar. This means both Sabrina and Zach are trustworthy (since there are only two liars). We then know Cassiopeia and Andrea are liars since Sabrina is trustworthy.

Now we can tally our clues:

Keith:

Our code is in the form of x...x and x is one of 2, 3, 5, 7.

Sabrina:

Our code page includes 0 to 7.

Cassiopeia:

(Liar, so inverted) The last four numbers do not follow 1, 4, 6, 4, 1

Andrea:

(Liar, so inverted) The latter half contains at least one odd digit.

Zach:

The code is like x123xxx... or x235xxx...

Bernard:

So we have xxx76543...xxx or something

Deduction:

Because we don't have 8s or 9s, the Bernard sequence can only range from 76543 to 43210.

Because the first and the last digits aren't used anywhere else, it can't be 3 (since it always appear in Bernard's sequence.

Note how Zach and Bernard has a common digit, we know our number is like x2354321xx...

So the Keith number can only be 7, and our number is 72354321xx..x7

I don't know what next, unfortunately.

Assume all information has been given, then our code is:

723543217, otherwise we don't know what would come before the last digit.