You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How can I assist you?

USER: I am not feeling well due to unexpected health issues so, please cancel my reservation.

ASSISTANT: Sure, I'll help you in that. can you please give me the name on which you have done the previous reservation?

USER: Sure, I have done it on the name of Thomas Robinson.

ASSISTANT: Fine, please be on hold.

USER: OK.

ASSISTANT: Thomas, I have searched our database regarding your reservation details but there is no reservation found active under your name to do cancellation.

USER: Ok, no issues any more.

ASSISTANT: Thank you for choosing us.

USER: Thanks for the kind information.