You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I address you?

USER: Due to sudden health issue, I would like to cancel my reservation. Can you please help me out with that?

ASSISTANT: Sure, will you please let me know your name?

USER: Thank you for considering my request. My name is Steven Lee.

ASSISTANT: Ok, please allow me few minutes to check the current status and revert you.

USER: Sure, take your time.

ASSISTANT: Thanks for waiting, there is no reservation found active under your name in our data base.

USER: Oh! I think it might be cancelled by my brother. Anyway, thank you.

ASSISTANT: Thank you for picking us.