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

ASSISTANT: Hello, how can I assist you?

USER: I would like to go to a beach in PHL, so could you please book a ticket?

ASSISTANT: Sure, I am here to help you. Please share me your airport codes?

USER: My source and destination airport codes are LAS and PHL.

ASSISTANT: May I know your planned dates of travel?

USER: I would like to go on 07/06 and return back on 07/08.

ASSISTANT: I am sorry to say there are no flights available on your requirement.

USER: That's ok, thank you.

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