You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I aid you today?

USER: I am Joseph Moore want to book a ticket to DC-DCA on 05/05, will you help with this? I need a stopover in my journey.

ASSISTANT: Sure, please provide your travelling days?

USER: I would like to catch a return flight on 05/07.

ASSISTANT: Please provide your origin airport code?

USER: I want to fly out from WA-SEA.

ASSISTANT: Thank you for your information, but sorry to inform you that there are no flights found according your specifications.

USER: Ok, not a problem.

ASSISTANT: Thank you for availing with us.

USER: Thank you for your information.