You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How can I help you?

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

ASSISTANT: Sure, can I know your name please?

USER: I have reserved my flight ticket with name Nicole Thompson.

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

USER: Ok, anyway thank you for checking.

ASSISTANT: Thank you for approaching us.