You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Brandon Wilson.

ASSISTANT: By what way shall I assist you now?

USER: I want to change my existing reservation due to heavy rainfall.

ASSISTANT: Ok. Give a minute.

USER: Ok.

ASSISTANT: I did not find any reservation with your name to change the reservation.

USER: Not an issue, thanks for your help.

ASSISTANT: Thank you for approaching us.