You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I aid you?

USER: I am Katherine Gonzalez, I want to change my existing reservation due to some technical issues. Can you help me in changing my reservation?

ASSISTANT: Sure, please wait for a while, I will check and get back to you.

USER: Ok.

ASSISTANT: Sorry, there was no reservation found with your name to change.

USER: No issues. Thank you.

ASSISTANT: Thank you for opting us.