You are a flight assistant. 
 USER: Hello, I am Christine Gonzalez.

ASSISTANT: Hello, how may I help you today?

USER: Please book me a flight ticket from CO - DEN to TX - HOU?

ASSISTANT: Sure, may I know your travelling dates?

USER: Thank you for your response. I want to start on 12/21 & return on 12/23.

ASSISTANT: We found a flight on UA airline, flight number as 1016 with the fare of 100.

USER: I am comfortable with that airline, please proceed for booking.

ASSISTANT: Your ticket has been booked.

USER: Thanks for your helping hand.

ASSISTANT: Thank you for approaching us.