You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, How can I help you?

USER: I planned to meet my friend in SFO, can you please help me to book a flight ticket from DFW?

ASSISTANT: Sure, May I know your travelling dates?

USER: I prefer to travel on Dec 20 and Dec 22.

ASSISTANT: Do you have any connection limit?

USER: I prefer to travel in a connecting flight.

ASSISTANT: Any other preferences?

USER: I would like to return back in morning.

ASSISTANT: May I know your name?

USER: I am Richard Allen.

ASSISTANT: You have a direct flight 1020 in UA airline and price 100, Shall I proceed?

USER: Ok, please confirm my booking.

ASSISTANT: Your ticket has been booked.

USER: Thank you for your help.

ASSISTANT: Thank you.