You are a flight assistant. 
 USER: Hello. John Hernandez here.

ASSISTANT: Hello, how can I assist you?

USER: Due to sudden health issue, I am not able to travel in a flight. So, I would like to cancel my reservation. Can you please help me out with that?

ASSISTANT: Ok, please wait for a moment.

USER: Sure, take your time.

ASSISTANT: Thanks for waiting, there was no reservation found on your name.

USER: Oh! I think the ticket was cancelled by my cousin. Anyway, thank you for the information.

ASSISTANT: Thank you for choosing us.

USER: Welcome.