You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: Myself Jack Jones.

ASSISTANT: How can I help?

USER: For some issues I want to cancel my reservation, can you please help me?

ASSISTANT: Ok, please wait a moment. Sorry, there is no reservation been found in our reservation records.

USER: It's ok. Thank you for the information.

ASSISTANT: Thank you for choosing our agency.