You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: I am Eric King.

ASSISTANT: How can I help you King?

USER: I want to change my reservation.

ASSISTANT: Sure, please wait. I will check your previous reservation.

USER: Sure.

ASSISTANT: Sorry, no active reservation found by your name.

USER: That's ok.

ASSISTANT: My pleasure, have a nice day.

USER: Thank you.