You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you?

USER: Can you please book a ticket from LAS to LGA?

ASSISTANT: Let me know the travel dates?

USER: My travel dates are on Mar 04 and Mar 06.

ASSISTANT: Is there any connection limit.

USER: No.

ASSISTANT: Do you have any class preferences?

USER: No.

ASSISTANT: Is there any time concern?

USER: No.

ASSISTANT: Is there any airline preference?

USER: No.

ASSISTANT: May I know your name please?

USER: My name is Robert Edwards.

ASSISTANT: Give me a moment.

USER: Sure.

ASSISTANT:  Robert Edwards, sorry to inform that  there are no flights on your route with the given dates.

USER: Ok, not a problem. Thank you.