You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Andrew Hernandez.

ASSISTANT: How can I assist you today?

USER: Can you please book a flight ticket from HOU to CLT?

ASSISTANT: Sure, I can help you with that. May I know your preferable travel dates please?

USER: Sure, I need to travel on dates of 10/31 and 11/02.

ASSISTANT: Ok, please wait for a while.

USER: Sure, take your time.

ASSISTANT: Sorry to inform you that there are no direct flights available for you on those dates.

USER: Oh! It is sad to hear. Anyway, thank you for your time.

ASSISTANT: You are welcome, thank you for choosing us.