You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Amy Davis.

ASSISTANT: How may I aid you Amy Davis?

USER: I want to change my existing reservation, due to some health issue. Can you please help me out?

ASSISTANT: Ok, please allow me to check with your previous booking for a moment.

USER: Sure, I will wait for your response.

ASSISTANT: Sorry to say, there is no reservation by your name.

USER: That's ok, thank you for your information.

ASSISTANT: Thank you for choosing our services.