You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How best can I serve you today?

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

ASSISTANT: Sure, I am here to help you with that.

USER: Thank you.

ASSISTANT: For changing your reservation, we need to know your name to check your reservation status. So, please forward me your name.

USER: Jacob Smith here.

ASSISTANT: Ok, please wait for a moment.

USER: Sure.

ASSISTANT: Sorry to inform you that, we have not found any active reservation on your name in our records.

USER: That's ok, no problem. Anyway thank you for checking out.

ASSISTANT: Thank you for reaching us.