You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, can you please tell me how may I assist you?

USER: I am Planning to attend New York LGA from Charlotte CLT. Can you find a flight ticket for me?

ASSISTANT: Sure, could you please tell me your preferred travel dates?

USER: Ok, my planned trip dates are on Mar 31 and Apr 02.

ASSISTANT: Ok, please tell me your preferred connection limit.

USER: Yes, I need a single connecting flight.

ASSISTANT: Ok, do you have class preference?

USER: Yes, I want to business class.

ASSISTANT: Ok , please share your other specifications if any.

USER: I want to return in the evening time.

ASSISTANT: May I know your good name please?

USER: Yes, I am Melissa Green.

ASSISTANT: Sorry to tell you, there is no flight found with the requirements you have given.

USER: Ok, not an problem. Thank you for your information.

ASSISTANT: You are welcome. Thank you for consulting us.