You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, what can I do for you today?

USER: I want to travel from DTW to CLT. Can you help me to book a flight ticket?

ASSISTANT: Sure, we are glad to help you. Do you prefer an economy class or a business class?

USER: I don't have any.

ASSISTANT: Ok, please specify your name.

USER: Daniel Young.

ASSISTANT: Ok, help me with your journey dates.

USER: I want to travel in the flight on Feb 24 and Feb 26.

ASSISTANT: Do you have any other concerns?

USER: I want to have a connecting flight.

ASSISTANT: Sorry to say that, no flights are found based on your information.

USER: That's ok. Anyways, thank you.

ASSISTANT: Thank you for choosing us.