You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you at this moment?

USER: I need to book a flight ticket from Boston to attend a meeting in Minneapolis & St. Paul. Can you please aid me?

ASSISTANT: sure, I am happy to help you with that. Can I have your travel dates please?

USER: Thank you. I am willing to travel on the dates of Mar 26 and Mar 28.

ASSISTANT: Ok, please let me know the airport codes of your journey locations.

USER: The origin and destination airport codes are BOS and MSP.

ASSISTANT: Do you prefer any specific class  to travel?

USER: No but I would prefer to travel in a single connecting flight.

ASSISTANT: Can I have your good name please to proceed further?

USER: My name is Catherine Taylor.

ASSISTANT: Ok, please be on hold for a moment.

USER: Ok, take your time.

ASSISTANT: Sorry Catherine Taylor, no flight is available to you on your dates.

USER: It's ok, I will choose some other source to travel. Thank you for your valuable time.

ASSISTANT: Thank you for choosing us, have a good day.

USER: Most welcome.