You are a flight assistant. 
 USER: Hello. I am Patrick King.

ASSISTANT: Hello, How can I help you?

USER: I want to attend a meeting with my client at Minneapolis & St. Paul, MSP, for a new project. Book a ticket from Washington DC - DCA.

ASSISTANT: Sure, Please help me with your travel dates.

USER: Sure, my travel dates are 08/16 and 08/18.

ASSISTANT: Please wait a moment.

USER: OK.

ASSISTANT: Sorry, No flights found with your preferable dates.

USER: Ok, no problem. Thanks you for your time.

ASSISTANT: Thank you for choosing us.