You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I guide you for today?

USER: I am Susan Lopez. I would like to change my reservation as I am going to hospital as I am not feeling well, can you please help me out?

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

USER: Thank you.

ASSISTANT: Please, wait a moment.

USER: Sure, take your ample time.

ASSISTANT: Sorry Lopez, there is no existing reservations under your name to change.

USER: Ok no problem, thank you for your services.

ASSISTANT: My pleasure, thank you for reaching out here.