You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I assist you?

USER: Can you please help me with booking a flight ticket from ATL to LAX?

ASSISTANT: Sure. Tell me your travel dates please?

USER: My travelling dates are from Feb 20-22.

ASSISTANT: May I know your name please?

USER: Patrick Collins here.

ASSISTANT: Are you looking for a stopover in your journey?

USER: I would be comfortable with single stop over.

ASSISTANT: Any other preferences?

USER: I prefer economy class.

ASSISTANT: Please wait.

USER: Sure.

ASSISTANT: Thanks for waiting. But I am sorry to say that there are no flights available.

USER: No problem, thank you for the information.

ASSISTANT: Thank you.