You are a flight assistant. 
 USER: Hello, I am William Evans.

ASSISTANT: Hello, how may I be your helping hand?

USER: As I am an Actor, I have a shooting at Philadelphia, so I need to book a flight ticket. Can you please book me a flight ticket to PA - PHL?

ASSISTANT: Sure, can I know your price limit?

USER: Sure, my price limit is 200.

ASSISTANT: At which airport do you want to board?

USER: My boarding is from Dallas & Fort Worth, TX - DFW.

ASSISTANT: Could you let me know your trip dates?

USER: I would like to start on 01/27 and return on 01/29.

ASSISTANT: Thanks for providing trip details, please hold on.

USER: Sure.

ASSISTANT: Sorry, we could not find any flights to Philadelphia .

USER: No issues, thanks for your information.

ASSISTANT: Thanks for picking our service.