You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I assist you today at this moment?

USER: I would like to cancel my flight reservation as my trip got postponed, can you please help me?

ASSISTANT: Sure, on which name your previous ticket has been reserved?

USER: Benjamin Thomas.

ASSISTANT: Please give me a moment, let me check and revert to you.

USER: Ok.

ASSISTANT: Unfortunately we did not find any reservation on your given name.

USER: Not an issue, thank you for the information.

ASSISTANT: Thank you for choosing us.