You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you the best today?

USER: I want to Change my recent reservation as my trip has been changed, help me in changing my reservation.

ASSISTANT: Sure, I can help you to change your reservation.

USER: Thank you.

ASSISTANT: Please let me know your name to change your reservation?

USER: Anna Green here.

ASSISTANT: Sorry, no reservation has been found with your name to change.

USER: Its ok, I think I have made my reservation in other agency.

ASSISTANT: Thanks for reaching us, have a great day.

USER: Thank you for your help.