You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you?

USER: Samantha Clark here. Could you book my ticket in a direct flight?

ASSISTANT: Sure, can I know your travelling dates?

USER: My itinerary dates are Feb 15 and Feb 17.

ASSISTANT: Ok, let me know your source and destination airport codes?

USER: My genesis and terminus airport codes are JFK and MSP.

ASSISTANT: Do you have any particular time for departing and returning?

USER: I want to depart in the afternoon.

ASSISTANT: Which class do you prefer?

USER: I have no preferences.

ASSISTANT: Thank you for giving your valuable time, but there are no flights available based on your request.

USER: No problem, thank you.

ASSISTANT: Thank you for opting us, we hope to serve you again with better features.