You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I assist you today?

USER: I am Laura Nelson.

ASSISTANT: Ok.

USER: My sports event has been postponed due to rainfall.So I want to change my existing reservation. Can you please help me?

ASSISTANT: Sure, please wait for a while.

USER: Sure.

ASSISTANT: Sorry to say that, there was no reservation found with your given name.

USER: Ok, no worries at all. Thank you for your help.

ASSISTANT: Thank you for choosing us.