You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I serve you?

USER: I am Raymond Edwards. I want to change my reservation due to heavy rainfall, Can you please help me?

ASSISTANT: Sure, we are euphoric to help you.

USER: Thank you.

ASSISTANT: Please  give me a minute.

USER: Sure.

ASSISTANT:  Thank you for waiting, but I am sorry to say that, there is no active reservation found with your name in our database to change it.

USER: Ok, thank you.

ASSISTANT: Thank you for choosing us.