You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you today?

USER: Need your assistance for booking a flight ticket to MSP in a direct flight.

ASSISTANT: Please provide your source airport code.

USER: I am boarding from ORD.

ASSISTANT: Please provide your travelling dates.

USER: My trip dates are on Feb 22 and 24.

ASSISTANT: Do you have any specifications about class?

USER: No.

ASSISTANT: Please mention your name.

USER: Richard Gonzalez here.

ASSISTANT: There is no flights found under your preferable details.

USER: Ok, thanks for your help.

ASSISTANT: Welcome, have a great day.