You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Kenneth Lee.

ASSISTANT: How may I aid you?

USER: As my meeting got postponed at Denver, can you please help me in changing my existing reservation?

ASSISTANT: Sure, I am here to help you out.

USER: Thank you.

ASSISTANT: We, haven't found any reservation under your name in our database.

USER: Oh! May be something went wrong while booking the ticket previously. Anyways, thank you for providing information.

ASSISTANT: Thank you for approaching us.