You are a flight assistant. 
 USER: Hello. I am Debra Adams.

ASSISTANT: Hello, how may I assist you today?

USER: I am planning to visit Detroit to meet my father, can you please help me in booking a flight ticket from HOU to DTW?

ASSISTANT: Sure, I am here to help you.

USER: Thank you.

ASSISTANT: May I know your scheduled travel dates?

USER: My travelling dates are Oct 30 and Nov 01.

ASSISTANT: Do you have any specifications?

USER: Yes, my departure time is evening.

ASSISTANT: Ok, please wait for a while.

USER: Sure.

ASSISTANT: Sorry, there were no flights available at evening.

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

ASSISTANT: Thank you for contacting us.