You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. What guidance do you require from our agency?

USER: Can you please book a flight ticket from SFO to ATL?

ASSISTANT: Sure, I need your planned journey dates to check the flight. Can you please provide it?

USER: Thank you. I have planned my travel  dates as Sept 17 and Sept 19.

ASSISTANT: Ok, please mention your requirement regarding the airlines.

USER: I am not specific about any airlines.

ASSISTANT: May I know your name for the documentation purpose?

USER: Sure, myself Stephen Allen.

ASSISTANT: I am really sorry to intimate you that, there are no flights running in this route on the dates you have given.

USER: Oh! It is sad to hear. Anyway, thank you for your time.

ASSISTANT: You are welcome. Anyways thank you for reaching us. We will serve you better next time.

USER: Most welcome.