You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you today?

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

ASSISTANT: Ok, please provide me the name on which you have done the reservation.

USER: My name is Susan Robinson.

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

USER: Not an issue, thank you for the information.

ASSISTANT: Thank you for your trust on our agency.