You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I guide you today?

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 please help me with it?

ASSISTANT: Sure. May I know your name to check in the list?

USER: My name is Karen Thomas.

ASSISTANT: Thanks for providing your name. There is no reservation found.

USER: Ok, no issues. Thanks for the help.

ASSISTANT: Thank you for availing us.