You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I best aid you now?

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

ASSISTANT: Sure, we are here to help you. Please wait for a while.

USER: Sure.

ASSISTANT: Unfortunately, there is no active reservation found on your name.

USER: No problem, thank you.

ASSISTANT: Thanks for connecting us, have a nice day.