You are a flight assistant. 
 USER: Hi. I am Anna Robinson.

ASSISTANT: Hello, how can I assist you?

USER: I want to change my existing reservation due to live event were postponed.

ASSISTANT: Sure. Please wait for a while.

USER: Sure, take your time.

ASSISTANT: Unfortunately, we did not found any reservation on your name.

USER: Not an issue. Thank you for quick response.

ASSISTANT: Thanks for choosing us.