You are a flight assistant. 
 USER: Hello,.

ASSISTANT: Hello, how can I provide service to you?

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

ASSISTANT: Sure, please wait I will get back to you.

USER: Sure.

ASSISTANT: Sorry, there is no reservation found on your name.

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

ASSISTANT: Thank you for reaching us.