You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you at this moment?

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

ASSISTANT: Sure, I will help you with this.

USER: Thanks.

ASSISTANT: Wait a moment please, let me check the database and get back to you.

USER: Ok.

ASSISTANT: Frank Walker, there is no active reservation found with your name in our database to change it.

USER: It's ok.

ASSISTANT: Thank you for contacting us.

USER: Thank you for the information.