You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you?

USER: I am planning to visit National Mall in Washington, DC-IAD on 09/12.Can you please help me for booking the flight ticket from MN-MSP?

ASSISTANT: Sure, may I know your travelling dates?

USER: The travelling dates are from 09/12 to 09/14.

ASSISTANT: Ok, may I know your name?

USER: Sure, I'm Benjamin Collins.

ASSISTANT: Sorry, no flight's available on your details.

USER: Thank you for your information.

ASSISTANT: Thank you for contacting  us.