You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I assist you?

USER: Help me in booking a flight from IAD to DTW?

ASSISTANT: Sure, may I know the travelling dates?

USER: My travelling dates are Mar 11 to 13.

ASSISTANT: Do you have any connection limit?

USER: I prefer connection flight.

ASSISTANT: Is there any other requirements?

USER: No.

ASSISTANT: May I know your name?

USER: I am Kathleen Garcia.

ASSISTANT: Sorry, no flights found with your preferable dates.

USER: That's ok, thank you.

ASSISTANT: Thank you for opting us.