You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you?

USER: I am Andrew Martinez, want to travel from MSP to DCA for my business meeting. Can you please help me?

ASSISTANT: Sure, may I know your trip dates?

USER: My travel dates are from 02/06 to 02/08.

ASSISTANT: Please wait for a while.

USER: Ok.

ASSISTANT: Sorry, we regret to inform you that there is no flight available as per your request.

USER: It's ok, thank you.

ASSISTANT: Most welcome.