You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: I am Charles Mitchell.

ASSISTANT: How can I assist you today?

USER: Owing an emergence, I want to cancel my recent reservation. Can you please help me with it?

ASSISTANT: Ok, I am glad to assist you. Please wait a moment to check in our reservation sheet. Thank you for waiting for my response, sorry as per the sheets there is no reservation been found to cancel.

USER: Ok, no issues. Thanks for the help.

ASSISTANT: Ok, thank you for choosing our agency.