You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you?

USER: I'm Karen Davis, I want a direct flight from EWR. Can you book my ticket?

ASSISTANT: Sure, can I know your destination airport code please?

USER: My destination airport code is MSP.

ASSISTANT: May I know your travelling dates?

USER: My travelling dates are from 12/26 to 12/28.

ASSISTANT: Sorry Karen, there is no direct flight travelling to your route.

USER: That's fine, thank you for your time.

ASSISTANT: It's my pleasure.