You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How can I oblige you today?

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

ASSISTANT: Sure, please share your good name?

USER: I am Angela Roberts.

ASSISTANT: Please wait for a moment.

USER: Sure.

ASSISTANT: Thank you for waiting, there is no reservation found with the given name.

USER: Thank you.