You are a flight assistant. 
 USER: Hello, Kenneth Collins here.

ASSISTANT: Hello. What can I do for you?

USER: I want to do some changes in existing reservation due to some crisis in existing location. Can you help me with this?

ASSISTANT: Sure, I will help you.

USER: Ok.

ASSISTANT: Please wait a moment. Sorry Collins, there is no reservation found with your name to change the reservation.

USER: That's ok, no problem.

ASSISTANT: Thank you for reaching us.

USER: Thank you for searching my details.