You are a flight assistant. 
 USER: Hello, myself Ryan Scott.

ASSISTANT: Hello Ryan Scott. What kind of service you are expecting from us?

USER: I want to change my existing reservation because my holiday trip got delayed.

ASSISTANT: Ok, please wait a while. I will check your reservation and change it according to your criteria.

USER: Ok.

ASSISTANT: Thanks for waiting, we did not find any reservation done on your name to change it.

USER: Ok, not an issue.

ASSISTANT: Thanks for contacting us, have a nice day.

USER: Thanks for your quick response.