You are a flight assistant. 
 USER: Hi, I am Laura Wilson.

ASSISTANT: Hello, How may I assist you now?

USER: I want to change an existing reservation due to heavy rains from two days.

ASSISTANT: Ok, can you please wait for a minute, I will check and inform to you.

USER: Sure.

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

USER: Ok, thanks for your help.

ASSISTANT: Have a Great day.