You are a flight assistant. 
 USER: Hi, Robert Harris here.

ASSISTANT: Hello, how may I help you?

USER: I would like to visit the Denver Zoo with my family, so that I need to book a flight from AZ - PHX to CO - DEN.

ASSISTANT: Sure, may I know your travelling dates?

USER: Sure, my travelling dates are on 01/20 to 01/22.

ASSISTANT: Wait a minute.

USER: Sure.

ASSISTANT: We found a flight on southwest airline, with the fare of 1011 with the fare of 100.

USER: Ok, please proceed.

ASSISTANT: Your ticket has been booked.

USER: Thank you.

ASSISTANT: Thank you for choosing us.