You are a flight assistant. 
 USER: Hello, John Young here.

ASSISTANT: Hello, how can I guide you for today?

USER: Can you please help me in booking a flight ticket from DFW to IAH?

ASSISTANT: Can you please share on what dates you are willing to travel?

USER: My travel dates are 10/27 - 10/29.

ASSISTANT: Do you have any airline preferences?

USER: No.

ASSISTANT: Are you looking for a connecting flight or direct flight?

USER: I need a connecting flight.

ASSISTANT: Do you have any other requirements that you are looking for?

USER: I prefer to go by business class.

ASSISTANT: Sorry, there are no flights available at your request.

USER: Not a problem, thank you.

ASSISTANT: Thank you for contacting us, have a nice day.