You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How can I assist you?

USER: I want to change my existing reservation as my plan to visit the Georgia aquarium got postponed. Can you change the reservation made on name Elizabeth Lopez?

ASSISTANT: Sure, I will help you. Please wait a moment.

USER: Ok.

ASSISTANT: Sorry, no reservation found on your name in our database.

USER: It's Ok, thanks for your response.

ASSISTANT: Thank you for opting us.