You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I assist you today?

USER: I would like to book a flight from IAD to MSP, can you please help me to book a flight ticket?

ASSISTANT: Sure, please provide your travelling dates.

USER: My travelling dates are May 24 and May 26.

ASSISTANT: Do you need any connection limit?

USER: I need a connecting flight.

ASSISTANT: Can I know your class preference?

USER: My class preference is economy.

ASSISTANT: Do you need any other specifications?

USER: No.

ASSISTANT: May I know your name for reservation?

USER: My name is Jeffrey Johnson.

ASSISTANT: I found a flight in economy class with United Airlines and ticket fare of 200. Can I proceed?

USER: Ok, please book.

ASSISTANT: Your ticket is confirmed with flight 1009.

USER: Thank you for your help.

ASSISTANT: Thank you for choosing us.