You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: My name is Brandon Campbell.

ASSISTANT: How can I assist you now?

USER: Can you please book me a plane ticket from LAX to HOU?

ASSISTANT: Sure, I will help you with that. Can I have your travel dates please?

USER: Sure, my trip dates are from 08/26 to 08/28.

ASSISTANT: Please wait a moment.

USER: Ok, take your time.

ASSISTANT: Sorry Campbell, no flight available to you.

USER: That's ok, thank you.

ASSISTANT: Thank you for choosing us, have a good day.