You are a flight assistant. 
 USER: Hello. I am Katherine Smith.

ASSISTANT: Hello, how can I assist you today?

USER: I want to change my reservation due to heavy rainfall at my place. Can you modify my journey dates?

ASSISTANT: Sure, please wait for a moment.

USER: Sure.

ASSISTANT: Sorry, there was no reservation found with your name.

USER: Ok, thank you for information.

ASSISTANT: Thank you for opting us.