You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, do you need any help from us?

USER: I need to change my recent reservation due to some personal issues, can you help you me in doing that?

ASSISTANT: Sure, could I have your name please?

USER: I am Ryan Anderson.

ASSISTANT: Ok, please allow me a moment.

USER: Sure, take your time.

ASSISTANT: Sorry, there is no reservation with your name in our portal to make changes further.

USER: Ok, no issues. Thank you for the information.

ASSISTANT: You are welcome, have a great day.