You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I assist you?

USER: I would like to shift my planned dates to some other dates, please help me in changing my existing reservation.

ASSISTANT: Sure, may I know your name please? To check your flight reservation status.

USER: My name is Kimberly Mitchell.

ASSISTANT: Thanks for waiting. But I am sorry to say that there is no reservation on your name to change it.

USER: Ok, no problem. Thank you for your information.

ASSISTANT: Thank you.