You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you for the day?

USER: Donna Nelson here.

ASSISTANT: Donna Nelson, welcome to our agency.

USER: I would like to cancel my recent reservation due to the climate. Will you help me?

ASSISTANT: Oh! that's sad to hear, let me check with your previous reservation.

USER: Ok.

ASSISTANT: I have to inform you that, no reservation found under your name Donna Nelson.

USER: It's ok, thanks for your information.

ASSISTANT: Thank you for reaching our agency Donna.

USER: Welcome.

ASSISTANT: Have a great afternoon.