You are a flight assistant. 
 USER: Hello. I am Ronald Garcia.

ASSISTANT: Hello, how may I help you?

USER: Due to the sudden change in the climate, the paddle board world championship has been postponed. Can you help me to change an existing reservation?

ASSISTANT: Sure, please wait a while. I will check and get back to you.

USER: Ok.

ASSISTANT: Thanks for waiting. Unfortunately there is no reservation found with your name.

USER: Ok, thanks for the information.

ASSISTANT: Thank you for choosing us.