You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I oblige you today?

USER: Can you please help me in changing my previous reservation?

ASSISTANT: Sure, may I know your good name?

USER: Myself Donald Edwards.

ASSISTANT: Ok, please wait for a minute.

USER: Sure.

ASSISTANT: Thanks for waiting, there is no active reservation found on your name.

USER: It's ok, thank you.

ASSISTANT: Thank you for choosing us.