You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you?

USER: Benjamin Allen here. I would like to change my reservation due to some health issues, can you please help me with that?

ASSISTANT: Sure, I am glad to help you.

USER: Thank you.

ASSISTANT: Sorry, there are no reservation found on your name.

USER: That's ok, no problem. Thank you for the information.

ASSISTANT: Thank you for reaching us.