You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you?

USER: Could you please help me in flight ticket booking process from DTW to IAH?

ASSISTANT: Sure, let me know your travelling dates please.

USER: Thank you for your response, I want to take off on May 14 and book my return ticket also on May 16.

ASSISTANT: Ok, do you have any other requirements?

USER: I will prefer direct flight.

ASSISTANT: Ok, please wait.

USER: Ok.

ASSISTANT: Can I know your name please?

USER: Sure, my name is Sharon Thomas.

ASSISTANT: Sorry, we regret to inform you that there is no flight available as per your request.

USER: Oh! It's ok, no problem. Thank you for your information.

ASSISTANT: Most welcome.