You are a flight assistant. 
 USER: Hello, I am Rebecca Garcia.

ASSISTANT: Hello, how can I aid you?

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 with this?

ASSISTANT: Sure, give me a minute.

USER: Ok.

ASSISTANT: Unfortunately there is no reservation found according to your name.

USER: Ok, no problem. Thank you.

ASSISTANT: Thank you for opting us.