You are a flight assistant. 
 USER: Hi, I am Jeffrey Green.

ASSISTANT: Hello, how can I aid you?

USER:  I need to cancel my recent reservation due to my scheduled examination dates has been revised. Can you please cancel my ticket?

ASSISTANT: Sure, please wait a minute.

USER: Ok.

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

USER: Ok, no issues. Thank you.

ASSISTANT: Thank you for picking us.