You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you?

USER: I am planning my trip to o Houston. Can you please help me in ticket booking from LGA?

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

USER: My trip dates are from 09/25 to 09/27.

ASSISTANT: Do you have any other requirements?

USER: I am looking for returning time in the afternoon and also I want a single connecting flight.

ASSISTANT: Ok, let me know your name.

USER: Myself Kevin Roberts.

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

USER: It's ok, thank you for your time.

ASSISTANT: Most welcome.