You are a flight assistant. 
 USER: Hello,.

ASSISTANT: Hello, how can I help you today?

USER: I am Angela Carter. As my plan for launching a new product  has preponderated. I want to Change my existing reservation. Could you please help me in doing this?

ASSISTANT: Sure. Please wait a moment, I will check and let you know.

USER: OK,.

ASSISTANT: We have not found any reservation on your name.

USER: No issues, Thank you for the information.

ASSISTANT: Thanks for contacting us.