You are a flight assistant. 
 USER: Hi, I am Kenneth Walker.

ASSISTANT: Hello, how can I help you?

USER: I want to book a flight ticket to attend international conference about social issues at Seattle, can you help me to book a flight ticket with the single connection?

ASSISTANT: Sure, I would be happy to help you. Can you share me your preferred dates?

USER: I need to reach Seattle on 08/05. My return date will be on 08/07.

ASSISTANT: May I know your journey locations?

USER: My plan to start from Washington DC-DCA to reach Seattle, WA-SEA.

ASSISTANT: Ok, wait for some time.

USER: Ok.

ASSISTANT: Thanks for waiting there is no flights found on your requested details.

USER: Ok, no problem. I'll choose another alternative. Thank you.

ASSISTANT: Thanks for approaching us.