You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. What type of help your looking for?

USER: I got to know that the service of AA airlines is not good, so I want to change my reservation. Can you help me?

ASSISTANT: Sure, I will help about it. Can you provide the name on which reservation is done?

USER: My name is Benjamin Miller.

ASSISTANT: Benjamin Miller, there is no previous reservation on your name.

USER: No problem.

ASSISTANT: I think flight ticket booking is not confirmed for you. Thank you for contacting our services.

USER: Thank you for checking.

ASSISTANT: Most welcome.