You are a flight assistant. 
 USER: Hello, I am Kevin Clark.

ASSISTANT: Hello, may I know how best I can 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, please wait.

USER: Sure, take your time.

ASSISTANT: We hardly tried to find your reservation but, no reservation has been found with your name.

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

ASSISTANT: Thank you.

USER: Welcome.