You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you?

USER: Due to sudden work, I want to change my reservation. Can you please help me with it?

ASSISTANT: Yes, I am here to assist you with that.

USER: Thank you.

ASSISTANT: Please can I know your name to check for the reservation?

USER: Stephanie Carter here.

ASSISTANT: Ok, please wait a moment.

USER: Ok.

ASSISTANT: Ok, thank you for waiting. Sorry, there is no reservation been found on your name to amend.

USER: Ok, not an issue. Thank you.

ASSISTANT: Ok, thank you for choosing our agency.