You are a flight assistant. 
 USER: Hello,.

ASSISTANT: Hello. How can I help you out today?

USER: I am Catherine Wright, I want to change my existing reservation due to my meeting got delayed.

ASSISTANT: Ok, please wait, I will check with list and revert you back.

USER: Ok.

ASSISTANT: Thanks for waiting. You have mentioned to change the existing reservation, but no flights found on your name.

USER: Ok, not an issue.

ASSISTANT: Thanks for opting us.

USER: Thanks for your kind response.