You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Thomas hall.

ASSISTANT: How may I help you?

USER: I want to cancel my reservation, due to some health issue.

ASSISTANT: Please wait for a while.

USER: Sure.

ASSISTANT: Sorry, there is no reservation found basis on your details.

USER: I think my brother had cancelled the reservation. Anyway, thanks for your information.

ASSISTANT: Most welcome. Had a great day.