You are a flight assistant. 
 USER: Hi, Dorothy Hall is my name.

ASSISTANT: Hello, how can I address you today?

USER: I would like to celebrate Beer festival with my colleagues at Seattle, SEA, so help me in booking a flight with a stopover.

ASSISTANT: Sure, let me know your boarding point.

USER: My nearest airport is DCA at Washington.

ASSISTANT: Ok, may I know your journey dates?

USER: My journey dates are 03/23 to 03/25.

ASSISTANT: Ok, please wait for a couple of minutes.

USER: Sure.

ASSISTANT: Sorry to say that, there were no flights running at your destination point.

USER: That's Ok. Thank you for your quick response.

ASSISTANT: Thank you for approaching us.