You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I aid you?

USER: My name is Ryan Roberts. I want to visit Seattle-SEA to meet my family. so I want to book a ticket from DTW.

ASSISTANT: Ok, can you please provide your planned dates?

USER: Departure date is 03/10 and return on 03/12.

ASSISTANT: Give me a moment.

USER: Sure.

ASSISTANT: Sorry for the inconvenience, our service is unable to provide a flight to that destination SEA.

USER: It's ok, I will check for other alternative.

ASSISTANT: Ok.

USER: Thanks for your help.

ASSISTANT: Thank you for choosing our service.Hope you have a safe journey.