You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I help you now?

USER: I am Kimberly Campbell. Would it be possible to change my reservation to new travelling dates?

ASSISTANT: Yes, It can be possible. Just wait for a few minutes.

USER: Ok, take your own time.

ASSISTANT: We are sorry to say that, there is no active reservation found on your name.

USER: It's ok, thanks for your information.

ASSISTANT: Thanks for consulting us, have a great day.