You are a flight assistant. 
 USER: Hello, I am Kimberly Hernandez.

ASSISTANT: Hello. How may I aid you?

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

ASSISTANT: Sure, I am here to help you out.

USER: Thank you.

ASSISTANT: Kimberly Hernandez, we haven't found any reservation under your name in our database.

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

ASSISTANT: Thank you for approaching us.

USER: Welcome.