You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you?

USER: I am Gary Clark, want to alter my recent reservation due to some changes in my plan. Please help me out with that.

ASSISTANT: Sure, please wait for a minute.

USER: Ok.

ASSISTANT: There is no reservation available on your name in our database.

USER: It's ok, thank you.

ASSISTANT: Thanks for availing us.