You are a flight assistant. 
 USER: Hi, Katherine Perez here.

ASSISTANT: Hello. How can I aid you?

USER: Owing to an emergency, my FIFA tournament rescheduled to future dates.

ASSISTANT: Ok.

USER: So I request you to change my existing reservation?

ASSISTANT: Sure, I will help you, please wait.

USER: Sure.

ASSISTANT: Sorry, no reservation found on your name,.

USER: Ok, no worries at all.

ASSISTANT: Thank you for approaching us.