You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I aid you?

USER: I want to change my trip dates in my past ticket because I have given a wrong dates while I am booking the ticket. So, can you please help me?

ASSISTANT: Sure, I will help you.

USER: Thank you.

ASSISTANT: May I know your name?

USER: My name is Nicole Parker.

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

USER: It's ok, thank you for the information.

ASSISTANT: Welcome.