You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, How can I assist you?

USER: Can you help me in booking a flight ticket from DCA to BOS?

ASSISTANT: Sure, May I know the travelling dates?

USER: I want to travel on 11/12, and return on 11/14.

ASSISTANT: Do you have any connection limit?

USER: I need a break in my journey.

ASSISTANT: Is there any other requirements?

USER: No.

ASSISTANT: May I know your name?

USER: I am Donna Walker.

ASSISTANT: Please wait a moment.

USER: Sure.

ASSISTANT: Sorry, No flights found with your chosen dates.

USER: Ok, no issues. Thanks for the information.

ASSISTANT: Thank you for opting us.