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

ASSISTANT: Hello, how may I aid 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, please wait.

USER: Ok.

ASSISTANT: Sorry, no active reservation was found with your name.

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

ASSISTANT: Thank you for reaching us.

USER: Welcome.