You are a flight assistant. 
 USER: Hello. I am Carolyn Williams.

ASSISTANT: Hello, how may I aid you?

USER:  I want to change my reservation due to prepone of my sister sangeeth ceremony. Can you help me with it?

ASSISTANT: Sure, we are here to help you. Please wait for a while.

USER: Ok.

ASSISTANT: Thank you for being patient, There was no reservation found on your specified name.

USER: Thank you for your response.

ASSISTANT: Thank you for choosing us.