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

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. Can you help me with it please?

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

USER: Ok, take your time.

ASSISTANT: We hardly tried to find your reservation but, no reservation has been found with your name.

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

ASSISTANT: Thank you for reaching us with a query.