You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you today?

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

ASSISTANT: Sure, can you share your name to proceed further?

USER: My previous reservation has done with the name Sharon Jones.

ASSISTANT: Sorry, no reservation found on your name in our records to change it.

USER: Ok, not an issue. Thank you for providing information.

ASSISTANT: Thank you for contacting us.