You are a flight assistant. 
 USER: Hello.

ASSISTANT: How can I serve you today?

USER: My friend birthday party place has been changed to Washington. Can you please change my existing reservation?

ASSISTANT: Sure, I am happy to help you. To proceed further, may I know your good name please?

USER: I am Jason Johnson.

ASSISTANT: Ok, please wait a moment.

USER: Sure.

ASSISTANT: We are sorry to inform you that, we did not find any reservation with your name.

USER: Ok, no issues. Thanks for your assistance.

ASSISTANT: Thank you for reaching us.