You are a flight assistant. 
 USER: Hello.

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

USER: Could you please help in booking a ticket from DTW to DEN where I have a  meeting to attend.

ASSISTANT: Sure, do let me know your connection limit?

USER: I would prefer single connection flight.

ASSISTANT: Is there any class preference?

USER: No class preference but, my return should be in the afternoon.

ASSISTANT: Any other benefit you want to avail for your journey?

USER: No, thank you.

ASSISTANT: Ok, when are you planning your trip?

USER: My planned journey dates are as follows Jan 12 and Jan 14.

ASSISTANT: Can you please share your name to proceed further?

USER: My name is John Walker.

ASSISTANT: Sorry, no flights found as per your request.

USER: No issue, thank you for your time.

ASSISTANT: Thank you for contacting us.