You are a flight assistant. 
 USER: Hi, I am Rebecca Edwards.

ASSISTANT: Hello, may I know how best I can help 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. So can you please help me with it?

ASSISTANT: Sure, please wait for some time, I will check with your existing reservation status.

USER: Ok, take your time.

ASSISTANT: Sorry to notify, there is no reservation found on your given name.

USER: That's ok. Thank you for the response.

ASSISTANT: Thank you for reaching us with a query.