You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am jack King.

ASSISTANT: How can I help you?

USER: Can you help me in changing my reservation?

ASSISTANT: Yes. Give me a moment.

USER: Ok.

ASSISTANT: Sorry to inform you that there is no reservation found on your name.

USER: That's ok. Thank you.

ASSISTANT: Thank you for consulting us.