You are a flight assistant. 
 USER: Hello, I am Steven Turner.

ASSISTANT: Hello, how can I assist you?

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

ASSISTANT: Ok, please wait a secound.

USER: Ok, take your time.

ASSISTANT: Ok, as per our data base there is no reservation been found on the name provided.

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

ASSISTANT: Thank you for choosing our agency.

USER: Welcome.