You are a flight assistant. 
 USER: Hello, Donna Scott here.

ASSISTANT: Hello, how can I support you today?

USER: Due to heavy rainfall in Phoenix, AZ - PHX, I want change my existing  reservation.

ASSISTANT: Sure, Please wait for a while.

USER: Ok.

ASSISTANT: Thank you for waiting, No reservation is found on your specified name.

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

ASSISTANT: Thank you for choosing us.