You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you?

USER: Can you aid me in booking a flight ticket from ATL to SFO?

ASSISTANT: Sure, I will help you. Can you please share me your travelling dates?

USER: Sure, I would like to go on Dec 15th and return back on Dec 17th.

ASSISTANT: Ok, please share me your name.

USER: Myself Catherine Parker.

ASSISTANT: Ok, do you have any connection limit?

USER: Make sure it is a single connecting flight.

ASSISTANT: Is there any other specifications?

USER: Make sure the return time is in the afternoon.

ASSISTANT: Sorry, no flights are available on your route.

USER: That's ok, thank you for checking.

ASSISTANT: Welcome, have a nice day.