You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you?

USER: I want to visit Space Needle  in Seattle.Can you please help me for booking the flight ticket?

ASSISTANT: May I know your travelling dates and airport codes?

USER: The airport codes are from WA-SEA to NV-LAS and travelling dates are from 02/26 to 02/28.

ASSISTANT: Sure, give me a minute?

USER: Ok.

ASSISTANT: Sorry to say that there is no flight  found.

USER: That's no problem.

ASSISTANT: May I know your name please?

USER: Sure, my name is Brandon Collins. Thank you for your information.

ASSISTANT: Thank you.