You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I assist 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 please help me in changing an existing reservation?

ASSISTANT: Sure, may I know your good name?

USER: I am Richard Rodriguez.

ASSISTANT: Ok, please wait for a minute I will revert to you.

USER: Ok.

ASSISTANT: There is no reservation found with your name.

USER: Ok, no problem. Thanks for your information.

ASSISTANT: Thanks for availing us.