You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: Myself David Turner.

ASSISTANT: How can I help you David?

USER: I need to visit SFO for study of wildlife and research, can you book me a ticket?

ASSISTANT: Sure.

USER: My origin airport code is PHX.

ASSISTANT: May I know your trip dates?

USER: My dates are from 05/13 to 05/15.

ASSISTANT: Please wait a while.

USER: Sure.

ASSISTANT: Yes, Delta airline with flight 1018 is available for you. Shall I book?

USER: Book it for me.

ASSISTANT: Ok.

USER: Thanks for my booking.

ASSISTANT: Your flight is booked. Welcome.

USER: You are welcome.