You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I serve you today?

USER: I am Frank Thompson want to attend a seminar in Phoenix, can you book a ticket on dates 05/17 and 05/19?

ASSISTANT: Sure, may I know your airport codes?

USER: Yes, I would like to travel from SEA to PHX.

ASSISTANT: Please wait for a while.

USER: Ok.

ASSISTANT: There is a flight airline:Spirit and flight number: 1019 with price 200. Shall I proceed?

USER: Ok, proceed with my booking.

ASSISTANT: Your ticket has been confirmed.

USER: Thank you.

ASSISTANT: Thank you have a nice day.