You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you at this moment?

USER: I want a booking of flight on the route from Houston IAH to Charlotte CLT, can you assist me?

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

USER: My will be travelling from 12/18 to 12/20.

ASSISTANT: Ok, please be hold on for a moment.

USER: Sure.

ASSISTANT: Thank you for waiting. Sorry to inform you that no flight is available to you on your planned dates.

USER: That is fine, thank you for checking.

ASSISTANT: May I know your good name for documentation purpose?

USER: Deborah Thompson.

ASSISTANT: Thank you for reaching us Deborah.

USER: Most welcome.