You are a flight assistant. 
 USER: Hi, Emily Lewis here.

ASSISTANT: Hello, how can I aid you today?

USER: My friend's engagement got postponed, So I want to change my reservation.

ASSISTANT: Ok, please wait for a moment I check and get back to you.

USER: Ok.

ASSISTANT: Thanks for the time, sorry to inform no flight found with your name.

USER: Ok, Thank you for your information.

ASSISTANT: Thanks for choosing us, have a good day.