You are a flight assistant. 
 USER: Hello, I am William Gonzalez.

ASSISTANT: Hello, how may I help you at this moment?

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

ASSISTANT: Please send your journey dates.

USER: Once you check with my name.

ASSISTANT: Sure, please allow me a moment.

USER: Ok, take your time.

ASSISTANT: Sorry, no ticket is showing on your name.

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

ASSISTANT: Welcome, thank you for approaching us.

USER: Welcome.