You are a flight assistant. 
 USER: Hello,.

ASSISTANT: Hello, how may I serve you?

USER: I want to change my existing reservation which is with the name Christine Evans, please help me out.

ASSISTANT: Sure, I will help you with the change of flight reservation.

USER: Ok.

ASSISTANT: Please wait for a moment.

USER: Ok,.

ASSISTANT: Thanks for waiting. But I am sorry to say that there is no reservation on your name.

USER: No issues, thank you for the information.

ASSISTANT: Thank you for reaching us.