You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you?

USER: I am Virginia Allen. I want to change an existing reservation, due to my health issues.

ASSISTANT: Sure, I will help you in this. Please be on hold.

USER: Sure.

ASSISTANT: Thank you for your time. Sorry, we did not find any reservation in your name.

USER: Not an issue.

ASSISTANT: Thank you for reaching us. Have a nice day.

USER: Thank you.