You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I guide you?

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

ASSISTANT: Sure, I can help you to change the ticket details. Can you please  confirm me your name to check the ticket status?

USER: My previous reservation has done with my name Kenneth Phillips.

ASSISTANT: Ok, please give me a minute.

USER: Sure.

ASSISTANT: Sorry for the inconvenience, there is no active reservation found with your name to change.

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

ASSISTANT: You are welcome. Thank you for approaching us.