You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you?

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

ASSISTANT: Sure, I will help you.

USER: Thanks.

ASSISTANT: Sorry to say, there is no reservation on your name in our database.

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

ASSISTANT: Thank you for contacting us.