You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How can I help you today?

USER: Will you please assist me to change my existing reservation as my plan to meet my friend got postponed?

ASSISTANT: Sure, I am happy to help you.

USER: Thank you.

ASSISTANT: Please, share me your good name to check your reservation status.

USER: Dorothy Campbell.

ASSISTANT: Ok, please be on hold for a while.

USER: Ok.

ASSISTANT: We regret to say that, we have not found any active reservation on your name in our records.

USER: No issue. Thank you.

ASSISTANT: Thank you for opting us.