You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you today?

USER: Can you help me to book a flight ticket from CLT to MSP?

ASSISTANT: Sure, can you please provide your journey dates?

USER: My travelling dates are 19 and 21 of Dec.

ASSISTANT: Do you need any preferred class?

USER: No.

ASSISTANT: Do you have any other specifications to be met?

USER: I need a direct flight.

ASSISTANT: May I know your name?

USER: I am Angela Allen.

ASSISTANT: Ok, please wait.

USER: Sure.

ASSISTANT: Thank you for your valuable time, unfortunately no flights available on that route.

USER: It's ok, not a problem, thank you.

ASSISTANT: Thank you for opting us.