You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Mary Martinez.

ASSISTANT: Mary Martinez, how may I assist you with today?

USER: I am planning to change an existing reservation, due to health issue. Can you please change my reservation?

ASSISTANT: I am sorry to hear that, I will help you. Yes, Please allow me a minute.

USER: Sure.

ASSISTANT: I have gone through our database, I see that there is no active flight ticket booked on your name.

USER: No issues, thank you for your time.

ASSISTANT: Thank you for reaching us. Have a good time.