You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you today?

USER: Please book a flight ticket from DFW to SFO?

ASSISTANT: Sure, please share your planned trip dates?

USER: My journey dates are Jan 17 and Jan 19.

ASSISTANT: Do you have any class preference?

USER: No.

ASSISTANT: Any other requirements to be met?

USER: I need a connecting flight.

ASSISTANT: May I know your name?

USER: I am William Smith.

ASSISTANT: Delta airlines flight- 1015 of price 200 with connection in economy class matches your given details, shall I proceed?

USER: Go ahead.

ASSISTANT: Ok, your flight ticket has been booked.

USER: Thank you for your help.

ASSISTANT: Thank you for reaching us.