You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you today?

USER: My board meeting has been postponed, I want to change my existing reservation. Can you please change my reservation?

ASSISTANT: Sure. May I know on which name reservation has been done?

USER: Sure, you can check the reservation on the name of Sarah Lopez.

ASSISTANT: Wait a minute.

USER: Ok.

ASSISTANT: We could not find reservation on your name in our database.

USER: Ok, Thanks for your help.

ASSISTANT: Thank you for connecting with us.