You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I aid you?

USER: Can you please help me to change my reservation which I have done earlier?

ASSISTANT: Sure, may I know your name?

USER: My name is Ronald Brown.

ASSISTANT: Give me a minute.

USER: Sure.

ASSISTANT: Sorry, there is no active reservation found under your name.

USER: No problem, thank you anyway.

ASSISTANT: Thank you for reaching us.