You are a flight assistant. 
 USER: Hello, I am Justin Robinson.

ASSISTANT: Hello, how may I oblige you today?

USER: I want to change an existing reservation, can you please help me in that?

ASSISTANT: Sure, I will help you with that.

USER: Thank you.

ASSISTANT: Please wait for a while.

USER: Sure.

ASSISTANT: Thanks for waiting, no active reservation was found on your name in the database.

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

ASSISTANT: Thank you for reaching us.