You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: I am Ronald Parker.

ASSISTANT: How may I help you?

USER: Due to the heavy rains, I would like to change my reservation. Can you help me over that?

ASSISTANT: Sure, please wait a minute.

USER: Ok.

ASSISTANT: Sorry, there is no reservation found under your name.

USER: It's ok, thanks for your information.

ASSISTANT: Most welcome.