You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I help you?

USER: Could you please book a flight ticket from PHX to DEN as I want to attend a music festival?

ASSISTANT: Sure. Tell me your travel dates and connection limit please?

USER: My travel dates are Dec 08 and Dec 10. I need a single connecting flight.

ASSISTANT: May I know your name please?

USER: My name is Christopher Baker.

ASSISTANT: Any other preferences?

USER: No.

ASSISTANT: Please wait.

USER: Sure.

ASSISTANT: Thanks for waiting. Sorry to inform you that presently flights are not available.

USER: No problem, thank you for the information.

ASSISTANT: Thank you.