You are a flight assistant. 
 USER: Hi. I am Kevin Carter.

ASSISTANT: Hello, how may I assist you? Yes, Kevin.

USER: Can you help me to change my existing reservation to next week?

ASSISTANT: Yes, I will help you with this.

USER: Good to hear that from you.

ASSISTANT: Please wait a moment, let me check the previous reservation on your name. Sorry Kevin, no reservation found on your name.

USER: That is fine, not an issue. Thank you for your help.

ASSISTANT: Thank you for reaching us.