You are a flight assistant. 
 USER: Hi. I am Michelle Miller.

ASSISTANT: Hello, how may I assist 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, wait a minute.

USER: Ok.

ASSISTANT: We could not find any reservation on your name.

USER: No issue. Thank you.

ASSISTANT: Thank you for reaching us.