You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I help you?

USER: I am Paul Johnson.

ASSISTANT: Nice to meet you Paul.

USER: I am planning to book a ticket from ORD to LAS. Can you please help me out?

ASSISTANT: Sure. May I know your travel dates please?

USER: I would like to travel on 02/03 and return back on 02/05.

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

USER: That's fine. Thank you for your service.

ASSISTANT: Thank you.