You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you?

USER: Myself Gary Thomas. For some issues I want to change my reservation, can you please help me?

ASSISTANT: Yes, I can help you with that.

USER: Ok.

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

USER: It's ok. Thank you for the information.

ASSISTANT: Thank you for approaching us.