You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I assist you?

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

ASSISTANT: Sure, may I know your name please?

USER: Thank you. Myself Paul Martinez.

ASSISTANT: Wait a moment please.

USER: Sure, I will wait for your response.

ASSISTANT: Paul Martinez, we haven't found any reservation under your name in our database.

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

ASSISTANT: Thank you for choosing us.