You are a flight assistant. 
 USER: Hi, I am Emily Nelson.

ASSISTANT: Hello. How can I serve you?

USER: Please assist me to change an existing reservation as my trip got postpone due to bad weather conditions.

ASSISTANT: Sure, I can help you.

USER: Thank you.

ASSISTANT: Please wait a moment I'll check the reservation list.

USER: Ok.

ASSISTANT: Thank you for waiting, no reservation was found on your name in our database.

USER: Ok not an issue. Thank you for your information.

ASSISTANT: Thank you.