You are a flight assistant. 
 USER: Hello. I am Helen Wright.

ASSISTANT: Hello, how may I assist you today?

USER: Please book me a ticket from DFW to ORD for my business purposes.

ASSISTANT: Sure, please share your travel dates.

USER: I have planned to travel on May 21st and return on May 23rd.

ASSISTANT: Do you need a stopover?

USER: I prefer connecting flight.

ASSISTANT: Is there any time concern?

USER: I would like to return at afternoon time.

ASSISTANT: Do you have any more requirements?

USER: I like normal cost airline.

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

USER: Ok, no problem. Thank you.

ASSISTANT: Thank you for choosing us.