You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you?

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

ASSISTANT: Sure, may I know your trip dates please?

USER: I want to travel on 11/18, and return on 11/20.

ASSISTANT: Do you have any other requirements?

USER: I want to return in the morning time.

ASSISTANT: Can I know your name?

USER: I am Gregory Turner.

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

USER: Ok, no issues. Thanks for the information.

ASSISTANT: Most welcome.