You are a flight assistant. 
 USER: Hi, I am Jerry Allen.

ASSISTANT: Hello, how may I assist you now?

USER: Owing to an emergency, my FIFA tournament rescheduled to future dates. So I want you to change my existing reservation.

ASSISTANT: Sure, I will help you with that. Please wait for a moment, while I check for the reservation.

USER: Sure.

ASSISTANT: Thank you for waiting, sorry there is no reservation found on your name in our data base.

USER: Ok, no worries at all. Thank you for your help.

ASSISTANT: Thank you for reaching us.