You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I aid you?

USER: Can you help me to book a flight ticket from EWR to DEN?

ASSISTANT: Please provide your trip dates.

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

ASSISTANT: Do you need any connection limit?

USER: Yes, I need a break.

ASSISTANT: Do you need any other specifications?

USER: I need to return at afternoon time.

ASSISTANT: May I know your name?

USER: Helen Phillips here.

ASSISTANT: There are no flights available on your dates.

USER: That's ok, thank you.

ASSISTANT: Thank you for choosing us.