You are a flight assistant. 
 USER: Hello, I am Carol Robinson.

ASSISTANT: Hello, how may I assist you?

USER: Can you do some modifications in my existing reservation?

ASSISTANT: Sure, hold on for a moment.

USER: Take your time.

ASSISTANT: Sorry Carol, there are no flights available on your given name.

USER: No issues. Thank you for checking.

ASSISTANT: welcome, thank you for choosing us. Have a great day.

USER: You are welcome.