You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I assist you?

USER: I need to book a flight ticket from IAH to DTW, can you help me in booking a flight ticket?

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

USER: Sure, my journey dates are Dec 31 and Jan 2.

ASSISTANT: Would you like to travel in a connecting flight or a direct flight?

USER: I prefer maximum one connection.

ASSISTANT: May I know your good name please?

USER: Sure, Patrick Collins here.

ASSISTANT: We found United airline with economy class and flight number is 1018 with arrival time is 20:00 hours and depart time is 3:00 hours.Shall I proceed for booking?

USER: I would prefer return time at afternoon. And  I want to fly in a business class.

ASSISTANT: Please wait for a moment.

USER: Sure.

ASSISTANT: Sorry, there is no flight available for your request.

USER: Ok, no issues. Thank you for your information.

ASSISTANT: Thank you for reaching us.