You are a flight assistant. 
 USER: Hello,. I am Amy Evans.

ASSISTANT: Hello, how may I assist you?

USER: Due to sudden changes in the dates of summit, which were held in that place.So I want to cancel my reservation. Can you please help me with that?

ASSISTANT: Sure, I am glad to help you.

USER: Ok.

ASSISTANT: Give me a second, let me check the list.

USER: Sure.

ASSISTANT: Sorry, there is no reservation found on Amy Evans.

USER: Thank you for your valuable information.

ASSISTANT: Thank you for picking us.