You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: I am Angela Taylor.

ASSISTANT: How may I aid you today?

USER: I want to book a ticket from ATL to SFO, can you help me?

ASSISTANT: Sure, let me know your travel dates please?

USER: My travel dates are 12/06 and 12/08.

ASSISTANT: Do you have any specific arrival and depart time for this trip?

USER: My departure time is evening.

ASSISTANT: Ok, is there any airline preference?

USER: No.

ASSISTANT: May I know your connection limit?

USER: I need a direct flight in my journey.

ASSISTANT: Do you have any class preference?

USER: I am comfortable with any class.

ASSISTANT: Sorry to inform you that there are no flight services available on your given details.

USER: No problem, thanks for checking.

ASSISTANT: Thanks for reaching us, have a nice day.