You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you?

USER: John Carter here. I would like to book a ticket to Chicago for a business meet.

ASSISTANT: Yes, can you tell me your travelling dates?

USER: My travel dates are as follows, July 26 and July 28.

ASSISTANT: Ok, can I know your nearest airport codes?

USER: My airport codes are DTW and ORD.

ASSISTANT: Give me a moment.

USER: Sure.

ASSISTANT: I have found an economy class ticket with a price of 100 and 1 connection.

USER: More over, I would prefer business class.

ASSISTANT: Sorry, no flight ticket found in business class.

USER: No problem, thank you for your time and information.

ASSISTANT: Thank you for contacting us.