You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: I am Jennifer White.

ASSISTANT: How may I help you at this moment?

USER: Please help me to book a flight ticket from SEA to DTW.

ASSISTANT: Sure, I am here to help you with that. Can I know your travelling dates?

USER: My trip dates are from Dec, 29 to Dec, 31.

ASSISTANT: Do you have any other specifications?

USER: I need to return in the evening and I need a single connecting flight.

ASSISTANT: Ok, may I know your class preference?

USER: No.

ASSISTANT: Sorry to say that, there are no flight's available based on your travelling dates.

USER: No problem, thanks for your information.

ASSISTANT: Thank you for reaching us.