You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, May I know your name please?

USER: I am Lisa Parker.

ASSISTANT: How can I serve you?

USER: As my to attend an international conference has been postponed, ang again it has to start in the next week. Can you please help me to change an existing reservation?

ASSISTANT: Sure, I will help you with that. Please wait a moment, I will get back to you.

USER: Sure.

ASSISTANT: Thank you for waiting. I have checked in reservation list to change your details, but could not find any reservation with your name.

USER: Ok, not an issue. Thank you for your effort.

ASSISTANT: Thank you for opting us, Have a great day.