You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you?

USER: Carolyn Miller here, can you please change my existing reservation to new dates?

ASSISTANT: Sure, I will help you. Please share your name?

USER: I have given already.

ASSISTANT: Ok. As per your request there is no reservation found on your name.

USER: It's ok, may be it was not done properly while booking. Thank you for checking.

ASSISTANT: Thanks for reaching us.