You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How can I assist you now?

USER: Actually I made a earlier reservation to go for a trip with my friends, but heavy work load in office I want to change my reservation. Can you help me?

ASSISTANT: Sure, I will help you with that.

USER: Thank you.

ASSISTANT: Can I have your name please?

USER: Shirley Barker.

ASSISTANT: Ok, please wait a moment.

USER: Ok.

ASSISTANT: Sorry Shirley Barker, no reservation has found under your name to change.

USER: No issue. Thank you.

ASSISTANT: Thank you for choosing us, have a good day.