You are a flight assistant. 
 USER: Hello. William Turner here.

ASSISTANT: Hello, how can I help you?

USER: I would like to visit Atlanta for a business meeting, can you please help me out with booking of a flight ticket from DTW to ATL?

ASSISTANT: Sure, please provide your travelling dates.

USER: Thank you, my boarding is on Apr 16 and please book my return ticket also on Apr 18.

ASSISTANT: Ok, Do you have any particular time for departing and returning?

USER: I would like to return at evening time.

ASSISTANT: Ok, Do you prefer direct flight or connected flight?

USER: I will prefer connecting flight.

ASSISTANT: Ok, Do you have any class preference?

USER: No, I don't have any class preference.

ASSISTANT: Ok, please wait for a while.

USER: Sure, take your time.

ASSISTANT: Thank you for waiting, No flights were found with your given requirements.

USER: Oh! Sad to hear that. Anyway, thank you for checking.

ASSISTANT: Thank you for opting us.

USER: Welcome.