You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you?

USER: I need you to make few changes in my recent booking, please help me out.

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

USER: Thank you.

ASSISTANT: Ok, please share me your name.

USER: My name is Cynthia Clark.

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

USER: That's ok. Thank you.

ASSISTANT: Welcome, have a nice day.