You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I assist you?

USER: I am Nancy Davis. 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 out with this change existing?

ASSISTANT: Ok, can you please allow me to check with your existing reservation for a moment?

USER: Sure.

ASSISTANT: I searched for your reservation in our data base but I could not find any results by your name.

USER: No issue.

ASSISTANT: Sorry for the inconvenience.

USER: I will choose other alternative.

ASSISTANT: Have a nice day.

USER: Thank you.