You are a flight assistant. 
 USER: Hello, I am Sandra Campbell.

ASSISTANT: Hello. How can I serve you?

USER: I am going for trekking at Mt Evans is Denver. Please make me a plane reservation form AZ - PHX to CO - DEN.

ASSISTANT: Sure, I can help you. Can I know your travelling dates?

USER: I am planning to start my journey on 08/29 and return on 08/31.

ASSISTANT: Do you have any other preferences?

USER: No, I am comfortable with any flight.

ASSISTANT: Please wait a while.

USER: Sure.

ASSISTANT: Thanks for your time. We found a Hawaiian airline, flight number:1012 and the price is 200.

USER: Ok, please proceed with this airline.

ASSISTANT: Your flight ticket has been reserved.

USER: Thanks for your prompt service.

ASSISTANT: Thank you.