You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. What type of service are you expecting from me?

USER: Katherine Nelson here.

ASSISTANT: Yes, Nelson.

USER: I would like to attend my brother's wedding anniversary in Washington. Can you help me in booking flight ticket?

ASSISTANT: Sure, I am here to help you. Can you please provide your travelling airport codes?

USER: My origin would be SEA and destination would be DCA.

ASSISTANT: On which dates you want to travel?

USER: I am planning to start my journey on 02/21 and return will be on  02/23.

ASSISTANT: Do you need any stopover in between your journey?

USER: Yes, I need a one stopover in between my journey.

ASSISTANT: Sorry Nelson, no connecting flights are available on your route.

USER: That's ok. Thank you for checking.

ASSISTANT: Welcome, have a nice day.