You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I help you now?

USER: I am Patricia Walker.

ASSISTANT: OK.

USER: I want to change my reservation due to heavy rainfall at boarding place.

ASSISTANT: Ok, we are happy to help you at you convenience.

USER: Thank you.

ASSISTANT: Sorry, we did not find any reservation on your name to change.

USER: Ok, not an issue. Thanks for informing.

ASSISTANT: Thanks for reaching us.