You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you today?

USER: Need your assistance to change my existing reservation, due to bad weather conditions.

ASSISTANT: May I know your good name?

USER: My name is Patrick Davis.

ASSISTANT: Please wait for a while.

USER: Sure.

ASSISTANT: I regret to inform you that is no active reservation found on your given name in our reservation database.

USER: Ok, thank you.

ASSISTANT: Thank you for choosing us.