You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I help you today?

USER: Can you help me booking a flight ticket from HOU to DTW?

ASSISTANT: Sure, I am here to help you with that. Can I know your planned trip dates?

USER: I will start on 03/11 and return on 03/13.

ASSISTANT: May I know your name?

USER: I am David Baker.

ASSISTANT: Do you have any other requirements?

USER: No.

ASSISTANT: Ok, wait for a minute.

USER: Sure.

ASSISTANT: Sorry to say that, there are no flights available based on your travelling dates.

USER: No problem, thank you for the information.

ASSISTANT: Thank you for approaching us.