You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I aid you?

USER: I want to visit my old friend at SFO, can you please help me in booking the ticket in a direct flight?

ASSISTANT: Sure, I am glad to help you in booking the flight ticket. May I know your respective source airport code?

USER: Sure, my source airport code is PHX.

ASSISTANT: Can you please provide your travel dates?

USER: Well, I'm planning to depart from my location on 08/07 and return by 08/09.

ASSISTANT: On which name I need to book the flight ticket?

USER: My name is Catherine Campbell.

ASSISTANT: Sorry Campbell, there are no flights available for your desired intent.

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

ASSISTANT: Thank you for reaching us.