You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I assist you?

USER: Can you please help me in changing my recent reservation?

ASSISTANT: Sure, I will help you in that.

USER: Ok.

ASSISTANT: Can you please share me your name to proceed next?

USER: Myself John Williams.

ASSISTANT: Sorry, there is no active reservation on your name.

USER: Ok, thanks for you information.

ASSISTANT: Thank you.