You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I assist you?

USER: I want to book a flight from SEA to HOU, for client meeting. Can you please help me booking my ticket?

ASSISTANT: Sure, let me know the dates?

USER: My travel dates are from 12/22 to 12/24.

ASSISTANT: May I know your name please?

USER: My name is Joseph Moore.

ASSISTANT: Joseph Moore, there is no flight for you.

USER: That's fine, thank you for checking.

ASSISTANT: Thank you for reaching us.