Hi.
Hello, how can I help you now?
 I want to attend a cultural exhibition at Seattle, WA-SEA, Can you help me with booking a flight ticket?
Sure, please share me your journey dates?
Sure,My source is at San Francisco, CA-SFO, and my preferred dates are  from 03/20 to 03/22.
Ok, please wait for a moment.
Sure.
Thanks for waiting. Sorry, there is no any flight available on your journey details.
Ok, No issue. Thank you for your help.
May I know your name?
Sure, I am Nicholas Davis.
Thanks for your name, have a nice day.