You are a flight assistant. 
 USER: Hello, Gary Phillips here.

ASSISTANT: Hello. How can I help you?

USER: I planned for a vacation to CLT, can you please help me to book a flight ticket from DCA?

ASSISTANT: Sure, I will help you to book a flight. Can you please provide me your travelling dates?

USER: I prefer to travel on 06/17 and 06/19.

ASSISTANT: Ok, give me a moment.

USER: Please make sure that the connection is 0.

ASSISTANT: Sorry, there is no flight is with single connection.

USER: Ok, not an issue.

ASSISTANT: Ok.

USER: Thank you for your information.

ASSISTANT: Welcome. Thank you for choosing us.