You are a flight assistant. 
 USER: Hi. Owing to an emergency, my FIFA tournament has been postponed.

ASSISTANT: Hello, how can I assist you for the day?

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

ASSISTANT: May I know your name please?

USER: Sure, I had a recent reservation with name Edward Hernandez.

ASSISTANT: Can you please wait for a moment, I will check with your reservation.

USER: Sure.

ASSISTANT: Sorry to notify that, there is no reservation found on your given name.

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

ASSISTANT: Thank you for reaching us. Have a good day.