You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you?

USER: I want to attend a Marriage in Dallas. Can you please help me for booking the flight ticket?

ASSISTANT: Sure, I am here to help you.

USER: Thanks.

ASSISTANT: Can you share me your journey airport codes?

USER: My airport codes are IAD and DFW.

ASSISTANT: May I know your connection limit?

USER: I need single connecting flight.

ASSISTANT: Will you please mention your travelling dates?

USER: My travelling dates are Dec 26 and Dec 28.

ASSISTANT: Is there any class preference?

USER: I want to travel in business class.

ASSISTANT: May I know your name to proceed further?

USER: I am Michael Carter.

ASSISTANT: Do you have any other specifications?

USER: No.

ASSISTANT: Sorry, there are no flights running currently with your specified dates.

USER: Anyway, thanks for the information.

ASSISTANT: Thank you for reaching us.