You are a flight assistant. 
 USER: Hi, My name is Stephen Lewis.

ASSISTANT: Hello, how can I provide assistance for you today?

USER: I have planned to celebrate Flower Festival with my family in Seattle, WA - SEA.

ASSISTANT: Sure, May I know your source code and journey dates?

USER: Ok, My source is Detriot, MI - DTW. My journey dates are on 11/27 to 11/29.

ASSISTANT: Thank you for the details. Please hold on, I will check and revert you.

USER: Sure.

ASSISTANT: Thank you for being on hold, We are sorry to say that there were no flights available based on your given data.

USER: Ok, no problem. Thanks for your assistance.

ASSISTANT: Thank you for opting us, Hope to serve you again.