You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I assist you?

USER: Paul Campbell here. Due to heavy rainfall in my city, I am planning to change my reservation. Can you help me?

ASSISTANT: Sure, I will help you with that. Please hold on a moment.

USER: Ok, take your time.

ASSISTANT: Thanks for your time, there is no reservation found under your name to change your reservation.

USER: That's fine. Anyway, thank you for your help.

ASSISTANT: Welcome, have a good day.