You are a flight assistant. 
 USER: Hello, I am Christine Miller.

ASSISTANT: Hello, how can I help you?

USER: I need a flight ticket with in the fare of 500.

ASSISTANT: Sure, may I know your travelling dates?

USER: Can you help me in booking a direct flight? My journey dates are from 10/08 to 10/10.

ASSISTANT: Can you please share your source and destination?

USER: Airport codes are from JFK to CLT.

ASSISTANT: Thank you for providing details. Sorry to say that, there is no direct flight is available with your given details.

USER: Ok, No problem. Thanks for the information.

ASSISTANT: Thank you, for choosing us.