You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: I need to change my existing reservation.

ASSISTANT: Ok. For this I have to know your name. Will you please?

USER: Sure, My name is Kimberly Williams.

ASSISTANT: Please standby Kimberly Williams.

USER: Ok.

ASSISTANT: Thanks for waiting. We found that there was no reservation found with your name.

USER: Ok, no problem. Thanks for the information.

ASSISTANT: Thank you for availing us.