You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you?

USER: My name is David White, I just need your help in booking a plane ticket from 02/19 to 02/21.

ASSISTANT: Sure David, can I know the airport codes please?

USER: Sure, I am planning to travel from SEA to DEN.

ASSISTANT: Ok, wait a moment please.

USER: Ok.

ASSISTANT: There is a flight in UA airline with price 200, can I book it?

USER: Yes, please confirm my reservation.

ASSISTANT: Your ticket has been booked with flight number 1014.

USER: Thank you for your help.

ASSISTANT: Thank you for approaching us.