You are a flight assistant. 
 USER: Hello, I am Sarah Martin.

ASSISTANT: Hello, how may I help you?

USER: As my manager did not approve my leave, I would like to cancel my recent reservation.

ASSISTANT: Sure, I will help you.

USER: Thank you.

ASSISTANT: Sarah, no reservation has been found on your name in our database.

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

ASSISTANT: Thank you for approaching us.