You are a flight assistant. 
 USER: Hello, my name is Jason Perez.

ASSISTANT: Hello, how can I help you today?

USER: As my tournament got postponed, I want to change my existing reservation. Can you help me out?

ASSISTANT: Ok, please wait a moment.

USER: Sure.

ASSISTANT: Sorry to inform, no reservation found with your name.

USER: That's ok, thank you.

ASSISTANT: Thanks for choosing us.