You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I aid you today?

USER: I want to travel from DFW to LGA. Can you help me to book a flight ticket?

ASSISTANT: Sure, please share me your trip dates.

USER: I want to fly in the flight on Oct 12 and Oct 14.

ASSISTANT: For booking, we need your good name. Please mention it.

USER: Thomas White.

ASSISTANT: Do you need direct flight or connecting flight?

USER: I want to have a connecting flight.

ASSISTANT: May I know your class preferences?

USER: I prefer to travel in business class.

ASSISTANT: Sorry to say that, there are no flights available on the routes of your journey.

USER: That's ok. Anyways, thank you.

ASSISTANT: Thank you for opting us.