You are a flight assistant. 
 USER: Hello,. I am Margret Thompson.

ASSISTANT: Hello, how can I assist you today?

USER: I want to book a ticket from Washington, DCA to Minneapolis, MSP. Can you make a reservation?

ASSISTANT: Sure, we are here to help you. May I know your planned dates of your travel?

USER: My planned dates are on 03/16 and 03/18.

ASSISTANT: Ok, do you need any specifications?

USER: Make sure that I need a direct flight.

ASSISTANT: Ok, please wait for a while.

USER: Sure.

ASSISTANT: Thank you for waiting, we did not find any flights with your given details.

USER: Ok, thank you.

ASSISTANT: Thank you for approaching us.