You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you?

USER: I am Matthew Walker. I want to book a direct flight ticket from DTW to IAH. Could you help me in booking?

ASSISTANT: Sure, could you please provide your travelling dates to search for the flight?

USER: My travelling dates are from Sep 19 to Sep 21.

ASSISTANT: Please wait for a moment.

USER: Ok.

ASSISTANT: There is a flight 1020 of Hawaiian airlines, shall I proceed?

USER: If it is direct flight. You can proceed.

ASSISTANT: Sorry, there is no direct flight as per your requests.

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

ASSISTANT: Thank you for reaching us.