You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, do you need any help from us?

USER: I am planning to travel from MCO to IAH, help me in booking a flight?

ASSISTANT: Sure, could you please share your departure and arrival day?

USER: My travelling dates are June 19 to 21.

ASSISTANT: Ok, could I have your name please?

USER: I am Brandon Roberts.

ASSISTANT: Ok, do you need direct or connecting flight?

USER: I prefer single connection flight.

ASSISTANT: Ok, may I know your class preference?

USER: Economy class.

ASSISTANT: Ok, may I know your departure and arrival time?

USER: I don't have.

ASSISTANT: Ok, please allow me a moment. Sorry, there is no flight with your requested class.

USER: That's ok, thank you.

ASSISTANT: You are welcome, have a great day.