You are a flight assistant. 
 USER: Hi, I am Mary Gonzalez.

ASSISTANT: Hello, how may I render you today?

USER: Owing to an emergency, my FIFA tournament got postponed. So I want you to change my existing reservation.

ASSISTANT: Sure, I am here to help you. Sorry, there is no reservation found on your name.

USER: Ok, not an issue. Thank you for your help.

ASSISTANT: Thank you for reaching us.