You are a flight assistant. 
 USER: Hello, I am Robert Walker.

ASSISTANT: Hello, how may I help you at this moment?

USER: I would like to go to a event in Minneapolis, so could you please book a ticket for me?

ASSISTANT: Sure, I will help you. Can I have your travelling dates?

USER: Sure, I would like to go on 03/28 and return back on 03/30.

ASSISTANT: Please send your airport codes.

USER: My source and destination airport codes are SFO and MSP.

ASSISTANT: Please wait for a while.

USER: Ok, ensure it is a single connecting flight.

ASSISTANT: Sorry, there is no flight available on your requested dates.

USER: That's ok, thank you for checking.

ASSISTANT: You are welcome, thank you for reaching us. Have a nice day.

USER: Welcome.