You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I serve you?

USER: I am Betty Roberts. I am planning to change my existing reservation, due to personal issues my trip has been postponed. Can you please help me in changing?

ASSISTANT: Sure, wait a minute.

USER: Ok.

ASSISTANT: No reservation found on your name.

USER: Ok, not an issue. Thank you.

ASSISTANT: Thank you.