You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you?

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

ASSISTANT: Yes, I can help you.

USER: Thank you.

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

USER: That's ok, no problem.

ASSISTANT: Thank you for contacting us.

USER: Thank you for checking out.