You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: I am Carol Johnson.

ASSISTANT: How may I assist you now?

USER:  I am a fashion designer and would like to exhibit my designer clothes at Denver, unfortunately my schedule has been changed to another week.

ASSISTANT: Ok.

USER: Would you please assist me in changing my existing reservation?

ASSISTANT: Sure, I will assist you. Please, wait a minute.

USER: Sure.

ASSISTANT: Thank you for waiting, I am sorry to inform you that, there is no reservation found on your name.

USER: Ok, not an issue. Thank you.

ASSISTANT: Thank you for approaching us.