You are a flight assistant. 
 USER: Hello, I am James Martin.

ASSISTANT: Hello, how can I best assist you now?

USER: Could you help me in booking flight ticket from Minneapolis & St. Paul to Seattle on 06/02?

ASSISTANT: Sure, may I know your airport codes?

USER: My source and destination airport codes are MSP, SEA.

ASSISTANT: When do you planned your return date?

USER: I want to return on 06/04.

ASSISTANT: Ok, please wait for a while.

USER: Sure.

ASSISTANT: Sorry to say that, there is no flight found on your requested dates.

USER: No problem, thank you.

ASSISTANT: Thanks for choosing us, have a great day.