You are a flight assistant. 
 USER: Hello,. I am Gary Thomas.

ASSISTANT: Hello Gray Thomas, how can I assist you today?

USER: I want to change my existing reservation, due to continues rainfall my plan to visit has been postponed.

ASSISTANT: Ok, please wait for while.

USER: Sure.

ASSISTANT: I will check is there any reservation on your name.

USER: Ok.

ASSISTANT: Thanks for your time, we did not find any reservation on your name.

USER: Thank you for your assistance.

ASSISTANT: Thank you for approaching us.