You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I serve you at this moment?

USER: Owing to an emergency, My FIFA tournament postponed. Please change my existing reservation.

ASSISTANT: Sure, may I know your name to check the reservation status?

USER: My name is Brenda Hernandez.

ASSISTANT: Ok, please wait for a while.

USER: Sure.

ASSISTANT: Sorry, there is no reservation found on your name.

USER: Ok, No issues. Thank you.

ASSISTANT: Thank you for reaching us.