You are a flight assistant. 
 USER: Hi, my name is George Harris from Houston.

ASSISTANT: Hello, how may I help you?

USER: I would like to visit the Magic Gardens at Philadelphia with my cousin, so that I need to book a flight to PA - PHL.

ASSISTANT: Sure, may I know your travelling dates?

USER: Sure, my travelling dates are on 11/13 to 11/15.

ASSISTANT: Ok, please help me with your origin airport code.

USER: My origin airport code is TX - HOU.

ASSISTANT: Sorry, there are no flights found on given schedule.

USER: No issues, thanks for your information.

ASSISTANT: Thank you for reaching us.