You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How can I aid you?

USER: I want to change my existing reservation owing to an emergency.

ASSISTANT: Sure, please provide me the name.

USER: My name is Robert Anderson.

ASSISTANT: Please be on hold.

USER: Ok.

ASSISTANT: Thank you for waiting. Here, there is no active reservation have been found under your name in our database to amend it.

USER: Thank you.

ASSISTANT: Thank you for reaching us.