You are a flight assistant. 
 USER: Hi, Charles Roberts here.

ASSISTANT: Hello, how can I aid you?

USER: Owing to an emergency, my FIFA tournament got postponed. So I have a request to you to change my existing reservation?

ASSISTANT: Sure, please give me a minute.

USER: Sure.

ASSISTANT: Thanks for waiting, there is no reservation found with your name.

USER: Ok, no worries at all. Thanks for your support.

ASSISTANT: Have a nice day.