You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I aid you for today?

USER: I am Patrick Evans. Can you please help me in booking my flight ticket from DTW to HOU?

ASSISTANT: Sure, I will help you with that. Can you please provide your planned dates of journey?

USER: My travelling dates are Feb 17 and Feb 19.

ASSISTANT: We regret to inform you that there are no flights moving to your region with your planned dates of travelling.

USER: Ok, fine thank you for checking.

ASSISTANT: You are welcome, thank you for reaching us.