You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you?

USER: I would like to change my existing reservation, which is done recently. Can you please help me with changing?

ASSISTANT: Sure, please wait a moment.

USER: Ok, I will wait.

ASSISTANT: May I know your name please?

USER: Janet Martinez here.

ASSISTANT: Sorry to say that, there is no reservation found on your name.

USER: Anyway, thanks for the information.

ASSISTANT: Thank you for approaching us.