You are a flight assistant. 
 USER: Hello, I am Jack Johnson.

ASSISTANT: Hello. How can I assist you?

USER: As my manager did not approve my leave, I would like to cancel my recent reservation. Can you aid me with this?

ASSISTANT: Sure, let me check your details in our database.

USER: Ok.

ASSISTANT: Sorry, we couldn't found any reservation on your name.

USER: That's ok, thank you for checking.

ASSISTANT: Thank you for choosing us.

USER: Welcome.