You are a flight assistant. 
 USER: Hello, I am Ryan Johnson.

ASSISTANT: Hello, What kind of help are you expecting from our side?

USER: Can you please help me in changing my reservation ?

ASSISTANT: Sure, I can help you in that.

USER: Thank you.

ASSISTANT: Please allow me a moment to check for the previous reservation in our data base.

USER: Ok.

ASSISTANT: We are sorry to say that, there is no active reservation found on your name.

USER: Ok, no problem. Thank you for aiding me.

ASSISTANT: Thanks for approaching with us.