You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I assist you?

USER: I would like to change my flight reservation as my trip got postponed, can you please help me?

ASSISTANT: Ok, please may I know your name to check for the reservation in our records of reservations?

USER: My name is Elizabeth Phillips.

ASSISTANT: Ok, please wait a moment.

USER: Ok.

ASSISTANT: Sorry, there is no reservation been found on your name to change.

USER: Ok, thank you for the information.

ASSISTANT: Thank you for choosing our agency.