You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, How may I assist you today?

USER: My meeting got postponed as of now, so I need to change my existing reservation. Can you help me with that?

ASSISTANT: Sure. May I Have your name?

USER: My name is Charles Moore.

ASSISTANT: Ok. Thanks for your time, but we did not find any reservation.

USER: No issue, thank you for your information.

ASSISTANT: Thank you.