You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I help you?

USER: Please help me to book a flight ticket in my preferable travel dates Dec, 8 and Dec, 10.

ASSISTANT: Sure, can I know your airport codes?

USER: DTW and SEA are my airport codes.

ASSISTANT: May I know your name?

USER: Elizabeth Clark here.

ASSISTANT: Do you need a stopover in between journey?

USER: Yes, I need a break.

ASSISTANT: May I know your other specifications?

USER: I need to return at evening time.

ASSISTANT: There are no flights available on your request.

USER: That's ok, thank you for the information.

ASSISTANT: Thank you for reaching us.