You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: I am Kenneth Williams.

ASSISTANT: How may I assist you?

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

ASSISTANT: Sure, I am here to help you out. Kenneth Williams, we regret to inform you that there is no reservation found on your name in our records.

USER: Ok, fine thank you for checking.

ASSISTANT: Thank you for reaching us.