You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How can I aid you?

USER: Due to bad weather, my FIFA tournament rescheduled to future dates. So I want you to change my existing reservation?

ASSISTANT: Ok, may I know your name?

USER: Sure, I had a recent reservation with name Janet Garcia.

ASSISTANT: Sorry no reservation found on your name.

USER: Ok, no worries at all.

ASSISTANT: Thank you, have  a nice day.

USER: Thanks for your help.