You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you today?

USER: I am looking for a flight from DFW to MSP, can you please help me in booking?

ASSISTANT: Sure, will you mention your travelling dates please?

USER: My travelling dates are Apr 16 and Apr 18.

ASSISTANT: Do you have any preferences about flight connections?

USER: I need a connecting flight.

ASSISTANT: Do you have any preferences about class?

USER: I am fine with any class.

ASSISTANT: Please mention your name.

USER: Sure, my name is Benjamin Evans.

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

USER: That's ok, thank you for checking.