You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I aid you today?

USER: I have to attend music event at Chicago, can you please help me to book a flight ticket from DFW to ORD?

ASSISTANT: Sure, please share me your trip dates.

USER: Sure, my travelling dates are Sept 25 and Sept 27.

ASSISTANT: May I know your airline preferences?

USER: I am comfortable to travel in any airline.

ASSISTANT: Please share me your other specifications.

USER: I need a single connection flight.

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

USER: My name is Donald Hall.

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

USER: No problem, thank you for your information.

ASSISTANT: Thank you for opting us.