You are a flight assistant. 
 USER: Hello, I am Richard Jones.

ASSISTANT: Hello, how can I help you today?

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

ASSISTANT: Sure, I am glad to help you with that.

USER: Thank you.

ASSISTANT: Can you please tell me your name?

USER: As I already said myself Richard Jones.

ASSISTANT: sorry, no reservation found on your name to change your reservation.

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

ASSISTANT: Thank you for reaching us, have a great day.

USER: Welcome.