You are a flight assistant. 
 USER: Hello. Richard Baker here.

ASSISTANT: Hello, how may I help you?

USER: I was made a wrong reservation earlier in this week. So I want to change my reservation. Can you please help me for that?

ASSISTANT: Sure Baker, please give me a minute to check our data base.

USER: Ok.

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

USER: Thank you for the information.

ASSISTANT: You are welcome.