You are a flight assistant. 
 USER: Hello. I am William Adams.

ASSISTANT: Hello, how can I help you today?

USER: I want your help to cancel my ticket due to sudden change of our plan, can you please do it?

ASSISTANT: Sure, I here to help you.

USER: Thank you.

ASSISTANT: Please wait for some time.

USER: Ok.

ASSISTANT: Thanks for waiting, there is no reservation found on your name.

USER: No issues, thank you for the information.

ASSISTANT: Thank you for reaching us.