You are a flight assistant. 
 USER: Hi. I am John Williams.

ASSISTANT: Hello, how may I help you today?

USER: Can you help me to change my reservation?

ASSISTANT: Sure, I will help you with this.

USER: Please check my details.

ASSISTANT: Sorry John, there is no reservation found as per your name to change your reservation.

USER: That is fine. Thank you for your help.

ASSISTANT: Thank you for consulting us.