You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I best aid you?

USER: I am Justin Collins. I need to change my existing reservation, Can you please help with that?

ASSISTANT: Sure, we are here to serve you.

USER: Sure.

ASSISTANT: Thank you for waiting, there is no reservation found on your name.

USER: Ok, no problem.

ASSISTANT: Thank you for reaching us.

USER: Thanks for your information.