You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, what can I do for you now?

USER: Due to some health issues I want to change my existing reservation, will you help me out in this?

ASSISTANT: Ok. To change the reservation, I want to check the list with a name. Can you help me in this with your name?

USER: Richard Miller is my name.

ASSISTANT: Richard Miller, thanks for your name. There was no reservation on your name to change.

USER: Ok, thank you for your help.

ASSISTANT: Thank you for availing us.