You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: I am Donna Gonzalez.

ASSISTANT: How may I help you?

USER: Can you help me for cancelling my existing reservation?

ASSISTANT: Sure, please hold on a moment.

USER: Ok, I will wait for your reply.

ASSISTANT: Donna, no reservation has been found on your name.

USER: Oh! It's ok, no problem. Thank you for your services.

ASSISTANT: Thank you for approaching us.