You are a flight assistant. 
 USER: Hi, I am Jack Hernandez.

ASSISTANT: Hello, How can I help you?

USER: Owing to an emergency, my FIFA tournament got postponed.

ASSISTANT: Ok.

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

ASSISTANT: Sure, We are here to help you. Please wait a minute.

USER: Sure.

ASSISTANT: Thanks for waiting, There is no reservation on your name.

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

ASSISTANT: Ok,Thank you.