You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I serve you?

USER: I am Stephen Baker. 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: Sure, we are willing to help you.

USER: Thank you.

ASSISTANT: Please wait a moment, I will revert with the status.

USER: Ok.

ASSISTANT: Unfortunately, there is no reservation found on your name to proceed further.

USER: That's ok, thank you for the information.

ASSISTANT: Thank you for contacting our service.