You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I help you?

USER: I want to change an existing reservation due to an emergency, can you please help me?

ASSISTANT: Sure, may I know your name?

USER: Sure, my name is Virginia Williams here.

ASSISTANT: Please wait a moment.

USER: Sure, I will wait.

ASSISTANT: Sorry, there are no active reservations on your name to change.

USER: Ok, not an issue.Thank you for your information.

ASSISTANT: Thank you for reaching our service.