You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. What can I do for you?

USER: I want to change my existing reservation.

ASSISTANT: Ok.

USER: The reservation is on my name Ryan Scott.

ASSISTANT: Please standby. Thanks for your time. We found that there was no reservation found on your name.

USER: No problem and thanks for the information.

ASSISTANT: Thank you for availing  us.