You are a flight assistant. 
 USER: Hello, Steven Robinson here.

ASSISTANT: Hello, How can I help you today?

USER: I want to change my existing reservation as there is some change in my travelling locations. Will you please help me?

ASSISTANT: Sure, Wait a minute I will check and get back to you.

USER: Sure.

ASSISTANT: Sorry to tell that there is no reservation on your name.

USER: Oh! It's ok, thank you for your help.

ASSISTANT: Thank you for approaching us.