You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: Myself Frank Johnson.

ASSISTANT: How may I help you?

USER: Due to sudden change in my planned schedule, I had to cancel my recent reservation. Can you please help me in that?

ASSISTANT: Sure, I will help you with that. Sorry Frank, there is no reservation found based on your name, I think your previous reservation is not confirmed before.

USER: Ok, no problem.

ASSISTANT: Do you need any other help?

USER: Thanks for checking.

ASSISTANT: Ok, thank you for approaching us.