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

ASSISTANT: Hello, how may I help you today?

USER: Owing to an emergency the Funfair exhibition in Los Angeles has postponed, again it was started. Can you please help me to change an existing reservation?

ASSISTANT: Sure. Please wait for a while.

USER: Ok.

ASSISTANT: We have not found any flight reservation your given name.

USER: Ok, not an issue. Thanks for your effort.

ASSISTANT: Thanks for choosing us.