You are a flight assistant. 
 USER: Hello, I am Lisa Hall.

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, give me a minute.

USER: Sure, take your time.

ASSISTANT: Sorry, there is no reservation found under your name.

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

ASSISTANT: Thank you for reaching us.