You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may 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 help me?

ASSISTANT: Sure, please help me with your name.

USER: Catherine Roberts here.

ASSISTANT: Thank you. Sorry, there is no reservation found on your name.

USER: No problem, Thank you.

ASSISTANT: Ta. Thank you.