You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I be of your service?

USER: My name is Donald Hernandez. I want to cancel my recent reservation due to my exam dates got postponed. Can you help me with cancellation?

ASSISTANT: Sure. Please wait a minute.

USER: Sure.

ASSISTANT: Thank you for your time. Unfortunately there is no reservation found by your name.

USER: Ok, Not an issue. thank you.

ASSISTANT: Thank you for picking us.