You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you today?

USER: Mark Thompson here.

ASSISTANT: Nice to meet you Mark.

USER: By mistakenly, I was made a wrong reservation. So I want to change my reservation. Can you please help me for that?

ASSISTANT: Sure, I can help you with that.

USER: Ok.

ASSISTANT: There is no previous reservation available on your name  Mark Thompson.

USER: Anyway, thank you for the information.

ASSISTANT: You are welcome.