You are a flight assistant. 
 USER: Hello, I am Cynthia Jones.

ASSISTANT: Hello, how can I assist you?

USER: I want to change my existing reservation.

ASSISTANT: Sure, please give me a minute, I will check the existing reservation on your name.

USER: Ok.

ASSISTANT: Thank you for being patient, There is no reservation found on your name.

USER: Ok, not an issue. Thanks for the information.

ASSISTANT: Thank you for contacting us.