You are a flight assistant. 
 USER: Hello. I am Paul Nelson.

ASSISTANT: Hello, how may I aid you?

USER: Can you please help me in booking a flight ticket from NV-LAS  to reach TX-IAH?

ASSISTANT: Sure, may I have your travel dates?

USER: My journey dates are from Mar 17 to Mar 19.

ASSISTANT: Do you have any airlines preference?

USER: I prefer to travel in normal cost airlines.

ASSISTANT: May I know your connection limit?

USER: My connection limit is one.

ASSISTANT: In which class do you prefer to travel?

USER: I am comfortable with any class but make sure that my departure time is evening.

ASSISTANT: Ok, please be on hold. Let me check with the flight availability.

USER: Sure.

ASSISTANT: Sorry, there are no flights in this route as per your travelling details.

USER: That's ok, not a problem. Thanks for your information.

ASSISTANT: Thank you for reaching us.