You are a flight assistant. 
 USER: Hello.

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

USER: Will you help me in booking the flight ticket from DCA to ORD?

ASSISTANT: When you are willing to travel?

USER: My travelling dates are Oct 25 and Oct 27.

ASSISTANT: Do you have any class preference?

USER: I prefer economy class.

ASSISTANT: Do you have any connection limit?

USER: I need direct flight.

ASSISTANT: May, I know your good name?

USER: Myself Pamela Adams.

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

USER: Ok, not an issue.

ASSISTANT: Thank you for reaching us.