You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I assist you?

USER: I am Mary Green. I would like to travel from DTW to BOS for an important meeting, can you please search is there any flight available for me?

ASSISTANT: Sure, may I know your planned travel dates please?

USER: My journey dates are Jun 2 to Jun 4.

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

USER: I need a connecting flight which return in evening time.

ASSISTANT: Would you like to prefer direct flight or connecting flight?

USER: I need a connecting flight.

ASSISTANT: Which class do you prefer?

USER: No.

ASSISTANT: Sorry, there is no flight available in this route.

USER: No issue, thank you.

ASSISTANT: You are welcome.