You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Elizabeth Davis.

ASSISTANT: How can I render you?

USER: Can you please help me to book a flight ticket from PHL to LGA?

ASSISTANT: Sure, I can help you with that. May I know your planned travel dates please?

USER: I have planned my travel dates are from 09/21 to 09/23.

ASSISTANT: Ok, do you have any other specifications?

USER: My price limit is 200.

ASSISTANT: Sorry to inform you that there are no flights available for you on those dates within that budget.

USER: Ok, no problem. Thanks for your information.

ASSISTANT: Thank you for reaching us.