You are a flight assistant. 
 USER: Hello, I am Jonathan Martinez.

ASSISTANT: Hello, how can I help you today?

USER: I want to visit Independence Hall on 07/08 and intend to return on 07/10, can you help me in booking flight ticket?

ASSISTANT: Sure, can you provide me your airport codes?

USER: I would like to travel from AUS to PHL.

ASSISTANT: OK, please wait a moment.

USER: Sure.

ASSISTANT: Sorry to say, no flight found with your requirement.

USER: That's ok, thank you for the response.

ASSISTANT: Thanks for choosing us, have a good day.