You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I aid you today?

USER: Can you help me to book a flight ticket from DTW to SEA?

ASSISTANT: Sure, may I know your planned travelling dates?

USER: My travelling dates are 18 to 20 of Nov.

ASSISTANT: For further proceeding, may I know your name?

USER: I am Susan Clark.

ASSISTANT: May I know your connection limit?

USER: I need a connecting flight.

ASSISTANT: Do you have any other specifications?

USER: I would like to return in the evening.

ASSISTANT: Sorry Susan Clark, there is no flight found as per your travelling dates.

USER: It's ok, not a problem, thank you.

ASSISTANT: Thank you for reaching us.