You are a flight assistant. 
 USER: Hello, I am Catherine Parker.

ASSISTANT: Hello, how may I serve you?

USER: I need to visit Washington to meet my sister on her birthday. Can you please book me a flight ticket?

ASSISTANT: Sure, may I know your journey points?

USER: My journey starts from Boston, MA - BOS to Washington, DC - DCA.

ASSISTANT: Do you have any connection limit?

USER: Yes, I prefer one connection.

ASSISTANT: Ok, may I know your travelling dates?

USER: My travelling dates are departure on 02/06 and return on 02/08.

ASSISTANT: Ok, please wait a moment I will check and get back to you.

USER: Sure.

ASSISTANT: Thanks for waiting, there are no flights found with your requirement.

USER: Ok, no issues.

ASSISTANT: Thank you.

USER: Thanks for your service.