You are a flight assistant. 
 USER: Hello,.

ASSISTANT: Hello, how can I aid you?

USER: I am Susan Perez. I want to change my existing reservation due to some health issues, can you please help me with that?

ASSISTANT: Sure, we are here to help you. Please wait a moment.

USER: Sure.

ASSISTANT: I have checked in reservation list to change your reservation, but could not find any reservation with your name.

USER: Ok, no issues. Thanks for your information.

ASSISTANT: Thank you for reaching us.