You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: Sharon Lopez here.

ASSISTANT: Sharon Lopez. How can I assist you?

USER: Please help me out in booking the ticket from ATL to SFO.

ASSISTANT: Sure, may I know the travel dates.

USER: My trip dates will be Jan 25 to Jan 27.

ASSISTANT: Do you have any airline preferences?

USER: No.

ASSISTANT: May I know the trip limitations?

USER: I didn't get you.

ASSISTANT: Sure, would you like to have any connection limit.

USER: Yes, I need a connecting flight.

ASSISTANT: May I know the depart and return time.

USER: My depart time must be in the afternoon.

ASSISTANT: Do you have any class preferences?

USER: Yes, I want an economy class.

ASSISTANT: Are there any more preferences?

USER: No.

ASSISTANT: Give me a moment please.

USER: Ok.

ASSISTANT: I regret to inform that there are no flights available on your desired dates.

USER: That's ok.

ASSISTANT: Thank you for approaching us.

USER: Thank you.