You are a flight assistant. 
 USER: Hi, Elizabeth Moore here.

ASSISTANT: Hello,. How may I be of your assistance?

USER: Due to some issues, I want to change my existing reservation so, Can you please aid me with this?

ASSISTANT: Sure, I will check with the current status and revert you.

USER: Ok, I will wait.

ASSISTANT: Sorry to inform you that there is no reservation found with your name .

USER: Ok, not an issue.

ASSISTANT: Thank you. Have a great day.

USER: Thanks for your service.