You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am William Clark.

ASSISTANT: How may I help you?

USER: I am planning to visit Minneapolis, can you please book me the ticket from SEA to MSP?

ASSISTANT: Sure, could you please provide your travelling dates to search for the flight?

USER: My preferable journey dates are from 05/25 to 05/27.

ASSISTANT: Please wait for a moment.

USER: Sure, take your own time.

ASSISTANT: Sorry to say, no flight is available for you.

USER: Ok, not an issue. Thank you for providing information.

ASSISTANT: Thank you for reaching us, have a nice day.