You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: Dorothy Miller here.

ASSISTANT: How can I assist you today?

USER: Please help me out in booking the ticket from HOU to DTW.

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

USER: My trip dates will be Nov 1 to Nov 3.

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

USER: That's ok, no problem. Thank you for checking.

ASSISTANT: Thank you for choosing us.