You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you?

USER: My business trip was postponed and I want to change my reservation, can you help me?

ASSISTANT: Sure. May I know your name to change the reservation?

USER: My name is Dorothy Thompson.

ASSISTANT: No reservations found on your name. Thank you for reaching our service.

USER: Ok, thank you for checking.