You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: Frank Clark here.

ASSISTANT: How can I help you today?

USER: Due to sudden health issue, I am not able to travel in a flight on those dates, can you please help me out with cancelling of my reservation?

ASSISTANT: Sure, I can help you with that.

USER: Thank you.

ASSISTANT: Ok, please wait a moment.

USER: Sure, take your time.

ASSISTANT: There is no previous reservation found on your name Frank Clark.

USER: Oh! I think the ticket was not booked properly while I am booking. Anyway, thank you for the information.

ASSISTANT: Thank you for reaching us.

USER: Welcome.