You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: Kevin Walker here.

ASSISTANT: How can I help you Walker?

USER: Can you please help me in booking the ticket from HOU to LAS?

ASSISTANT: Please mention your travel dates.

USER: Sure, my travel dates are 02/01 and 02/03.

ASSISTANT: Ok, give me a moment.

USER: Sure, I'll wait.

ASSISTANT: Walker, no flight is available on your route.

USER: That's ok, thank you for giving the information.

ASSISTANT: Thank you for approaching us.