You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I assist you for the day?

USER: I want to book the flight ticket from DCA to DEN. Can you please help me?

ASSISTANT: When you are willing to travel?

USER: Dates are Apr 28 and Apr 30.

ASSISTANT: Do you have any connection limit?

USER: Connected flight required.

ASSISTANT: May, I know your good name?

USER: Debra Wilson here.

ASSISTANT: Sorry, we found no flights on your given dates.

USER: Not an issue. Thanks for checking.

ASSISTANT: Thank you for reaching us.