You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you at present?

USER: I need your assistance to make few changes in my recent booking.

ASSISTANT: Sure, we are here to change your reservation. May I know your good name please?

USER: My name is Eric Lopez.

ASSISTANT: Ok, please wait for a while.

USER: Sure, I will wait.

ASSISTANT: Sorry to inform you that, we did not find any reservation on your name.

USER: That's ok. Thank you.

ASSISTANT: Thank you for availing our service.