You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I assist you?

USER: I would like to change my existing reservation as my appointment with my lawyer got postponed. Can you help me with it?

ASSISTANT: Sure, Please share me your name.

USER: Scott Johnson is my name.

ASSISTANT: There is no reservation found with your name.

USER: Ok, thank you for the information.

ASSISTANT: Have a good day.