You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. Do you need any help from my side?

USER: I want to change my existing reservation. Could you help me with that?

ASSISTANT: Sure, I can help you and can you please let me know your name for checking purpose?

USER: Christine Jones here.

ASSISTANT: Please wait a moment.

USER: Ok.

ASSISTANT: There is no reservation obtained based on my search in our portal to change your booking.

USER: That's ok, no problem. Thank you.

ASSISTANT: Most welcome and have a great day.