You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, do you need any help from us?

USER: Can you please help me in booking the ticket from ORD to SFO? As I need to meet my old friend.

ASSISTANT: Sure, could you please share your departure and arrival day?

USER: Sure, my planned departure and return travel dates are 12th and 14th of July.

ASSISTANT: Ok, could I have your name please?

USER: Yes, my name is Deborah Clark.

ASSISTANT: Do you have any other requirements?

USER: Yes, I prefer business class ticket in single connected flight.

ASSISTANT: Sorry, there is no flight with your request.

USER: That's ok, thank you for giving the information anyways.

ASSISTANT: You are welcome.