You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I guide you?

USER: Can you please help me with booking a flight ticket from IAH to DCA?

ASSISTANT: Sure, I am here to help you with that. May I know your name please?

USER: My name is Stephen Evans.

ASSISTANT: Ok, can you please tell me when do want to depart and return?

USER: I would like to depart at May 24 and return at May 26.

ASSISTANT: Ok, please tell me your preference about the connections in between your journey.

USER: I need a connecting flight.

ASSISTANT: There is an economy flight available in this route, is that ok for you?

USER: I prefer business class.

ASSISTANT: Ok, please give me a minute. I will re-check for that.

USER: Ok.

ASSISTANT: There is a  flight in the JetBlue airlines which is a business class flight, it depart at 23:00 hours and returns at 19:00 hours. This flight is having a single connection limit and the ticket cost is 600. Is this fine for you?

USER: You can proceed with booking.

ASSISTANT: Ok. As per your request, I have reserved your ticket with the flight number 1004. Have a nice journey.

USER: Thank you.

ASSISTANT: You are welcome. Thank you for reaching us.