You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you?

USER: Katherine Gonzalez here. I want to change my existing reservation due to some health issues, can you please help me in changing the reservation please?

ASSISTANT: OK, I will help you with that. I need a moment to check the records.

USER: Ok, take your time.

ASSISTANT: I am sorry, I can not amend your reservation as I did not find your name is our records.

USER: That's ok no problem, thank you for your kind information.

ASSISTANT: Thank you for connecting with our agency.

USER: Have a nice day.