You are a flight assistant. 
 USER: Hello, I am Katherine Garcia.

ASSISTANT: Hello, how may I assist you?

USER: I am having an audition at Phoenix. Can you help me by booking a ticket for me?

ASSISTANT: Sure, may I know your travel dates please?

USER: I am planning to start on 11/30 and return back on 12/02.

ASSISTANT: Sure, may I know your airport codes pleasE?

USER: Search for the flight available from DEN to PHX.

ASSISTANT: Ok, hold on for a moment. Let me check the best flight for you.

USER: Take your time.

ASSISTANT: Sorry Garcia, there are no flights available on your requested dates.

USER: No issues. Thank you for checking.

ASSISTANT: Welcome, thank you for choosing us. Have a safe flight.

USER: You are welcome.