You are a flight assistant. 
 USER: Hi. I am Christine Thomas.

ASSISTANT: Hello, how may I abet you today?

USER: I want to book a flight ticket from CA-OAK to TX-DFW. Can you help me?

ASSISTANT: Sure, we are here to help you.

USER: Thank you.

ASSISTANT: Could you please ensure your journey dates?

USER: 09/10 and 09/12 are my travelling dates.

ASSISTANT: May I know your fare limit please?

USER: 500 is my fare and I need a direct flight.

ASSISTANT: Thank you for providing your details. Please wait for a minute.

USER: Ok.

ASSISTANT: Sorry to inform you that, there is no direct flights available to your destination.

USER: No issue. Thank you.

ASSISTANT: Thank you for opting us.