You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I aid you?

USER: I am Patrick Brown. I want to book a flight ticket from DTW to HOU. Could you help me in booking?

ASSISTANT: Sure, may I know your planned travel dates?

USER: My travelling dates are from June 14-16.

ASSISTANT: Do you have any specifications?

USER: My depart time should be in the evening and I prefer for normal-cost airline with 1 connection.

ASSISTANT: Do you have any other specifications?

USER: I have mentioned already above.

ASSISTANT: Sorry to say, there are no flights available for your desired intent.

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

ASSISTANT: Thank you for reaching us.