You are a flight assistant. 
 USER: Hello,. I am Elizabeth Lee.

ASSISTANT: Hello, how may I render you today?

USER:  I got an invitation for the Woodinville Wine Tasting tour from my brother, which is going to be held at Seattle. Can you book me a ticket within the range 200?

ASSISTANT: Sure, we are ecstatic to help you.

USER: Thank you.

ASSISTANT: Can you please let me know your journey dates that you prefer to travel?

USER: I want to travel on 08/07, and need to catch return flight on 08/09.

ASSISTANT: Kindly assign your source and destination points?

USER: I need to leave from my nearest airport DCA to reach SEA.

ASSISTANT: Ok, please hold on for a moment.

USER: Sure.

ASSISTANT: Sorry we did not find any flights matching your credentials.

USER: Ok, no problem. Thanks for the information.

ASSISTANT: Thank you for reaching us. Have a good day.