You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Michael Green.

ASSISTANT: Michael Green. How can I help you?

USER: Can you help me in booking my flight ticket from DTW to JFK?

ASSISTANT: Sure, May I know your itinerary dates?

USER: I want to start on May 11th, my return date is on May 13th.

ASSISTANT: Do you have any class preferences?

USER: I am ok, with any class.

ASSISTANT: Is there any time concern.

USER: My depart time should be in the morning.

ASSISTANT: Would like to travel by direct or single connection flight.

USER: I need a connecting flight.

ASSISTANT: Are there any more preferences?

USER: No.

ASSISTANT: Give me a moment.

USER: Sure.

ASSISTANT: Sorry to inform that there are no flights on your desired dates.

USER: That's ok, thank you.

ASSISTANT: Thank you for approaching us.