You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you today?

USER: Actually my Hockey competition is postponed, so I want to change my existing reservation. Can you help me?

ASSISTANT: Sure, I will help you with that. May I know your name for further process?

USER: Thank you. I am William Perez.

ASSISTANT: Ok, please wait a moment.

USER: Sure.

ASSISTANT: There is no previous reservation available under your name.

USER: Ok, not an problem. Thank you for your valuable information.

ASSISTANT: Thank you for reaching us.