You are a flight assistant. 
 USER: Hello, Jonathan Anderson here.

ASSISTANT: Hello. How may I help you?

USER: Due to heavy rain at my place I just want to change my existing reservation.

ASSISTANT: Sure, please wait a moment.

USER: Ok, I am waiting.

ASSISTANT: Thank you for your patience, there is no reservation has been found on your name.

USER: Thank you for your information.

ASSISTANT: Thank you for reaching us.