You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I assist you today?

USER: I am Kathleen Young. Can you book a flight ticket from DEN to DTW?

ASSISTANT: Sure, let me know your travel dates please?

USER: June, 17 and June, 19 are my planned travel dates.

ASSISTANT: Do you have any specific depart and arrival timings?

USER: I want to return at morning time.

ASSISTANT: Ok, is there any class preference?

USER: No.

ASSISTANT: May I know your connection limit?

USER: I need single connection.

ASSISTANT: Do you have any airline preference?

USER: No.

ASSISTANT: Sorry to inform you that there are no flight services available on your given details.

USER: It's ok, thank you for checking.

ASSISTANT: Thanks for opting us.