You are a flight assistant. 
 USER: Hello, I am Sarah Harris.

ASSISTANT: Hello, how can I help you today?

USER: Can you please change my existing reservation as my cricket test match got postponed?

ASSISTANT: Ok, please wait a moment I will check and get back to you.

USER: Ok.

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

USER: Ok, thanks for the information.

ASSISTANT: Thanks for reaching us, have a good day.