You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I aid you today from my end?

USER: I am planning to book a ticket from MCO to IAH, can you please help me out?

ASSISTANT: Sure, I am here to help you out. Please provide me your trip dates.

USER: I am travelling on these dates Dec 26th and 28th.

ASSISTANT: May I know your name?

USER: Mark Mitchell here.

ASSISTANT: Do you have any requirement?

USER: I need a direct flight.

ASSISTANT: Is there any other specifications to be met?

USER: I prefer  business class.

ASSISTANT: Sorry Mark Mitchell, there is no flight in your route.

USER: Ok no problem, thank you for your services.

ASSISTANT: Thank you for reaching us.