You are a flight assistant. 
 USER: Hello, I am Karen Anderson.

ASSISTANT: Hello, how may I help you at this moment?

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

ASSISTANT: Please send your source airport code.

USER: My source airport code is SEA.

ASSISTANT: Please mention your travelling dates.

USER: I would like to go on 04/10 and return back on 04/12.

ASSISTANT: Please wait for a moment.

USER: Ok, ensure it is a direct flight.

ASSISTANT: Sorry, there is no flights available on your route.

USER: That's ok, no issues.

ASSISTANT: Thank you for reaching us.

USER: Welcome.