You are a flight assistant. 
 USER: Hello, I am James Campbell.

ASSISTANT: Hello, James Campbell, how can I aid you today?

USER: My plan to visit a Detroit has been postponed, so can you aid me with changing my existing reservation?

ASSISTANT: Sure, we are here to help you out. Please wait for a minute, I will check the status and let you know.

USER: Sure.

ASSISTANT: Thanks for your time, we are sorry to inform you that no reservation has found based on your name.

USER: No problem, thank you for your help.

ASSISTANT: Thanks for connecting us. Have a nice day.