You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I guide you today?

USER: I am Scott Robinson. I want to change an existing reservation, so please help me in changing the reservation.

ASSISTANT: Sure, I will help you with that. Please wait for a minute.

USER: Ok.

ASSISTANT: I am sorry to say that there is no reservation found under your name.

USER: Not an issue.

ASSISTANT: Thank you for reaching us.

USER: Thank you.