You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I serve you?

USER: I am to visit NASA space center at Houston, TX-HOU from Charlotte, NC-CLT. So can you please help me to book a flight ticket?

ASSISTANT: Sure, we are here to help you. May I know your trip dates?

USER: My trip dates are from 09/23 to 09/25.

ASSISTANT: Do you need any halt in between?

USER: Yes, I need a halt in between my journey.

ASSISTANT: Okay, may I know your name?

USER: Sure, my name is Margaret Martin.

ASSISTANT: Sorry to say, currently there are no flights to your destination.

USER: That's not a problem. Thanks for your service.

ASSISTANT: Thank you for choosing us.