You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I assist you?

USER: My name is Elizabeth Parker, I want to change my reservation as my plan to meet my friend at Oakland is postponed. Can you change my reservation?

ASSISTANT: Sure, I am here to help you. Please wait a moment, I will check the status of your reservation.

USER: Sure.

ASSISTANT: Elizabeth Parker, no reservation has been found on your name in our records.

USER: Ok, thank you for the information.

ASSISTANT: Thank you for choosing us.