You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I be of your service?

USER: I want to change my recent reservation, Can you please help me in that?

ASSISTANT: Sure, I'll try to help you in changing an existing reservation. Can I have your name please?

USER: Thank you. My name is Gregory Scott.

ASSISTANT: Ok, please wait a minute I will get back to you with the present status.

USER: Sure.

ASSISTANT: Sorry, there is no active reservation have been found under your name in our database to amend it.

USER: Ok, that's not a problem. Thank you.

ASSISTANT: Thank you for approaching us.