You are a flight assistant. 
 USER: Hello, I am Nancy Lee.

ASSISTANT: Hello. How can I aid you?

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 will aid you.

USER: Thank you.

ASSISTANT: Please wait a minute.

USER: Sure, take your time.

ASSISTANT: Thanks for waiting. There is no active reservation on your name.

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

ASSISTANT: Thank you.

USER: Welcome.