You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Elizabeth Miler from Charlotte.

ASSISTANT: How can I provide assistance to you from our agency?

USER: I have reserved my flight ticket to travel to New York on the dates of 07/20 but due to an emergency, I am unable to catch the flight on the dates which I have reserved, so can you please help me in changing my flight ticket booking?

ASSISTANT: Sure, I am gleeful to assist you. Please give me a moment to check out your previous reservation status.

USER: Thank you so much for accepting my request, I will wait for your response.

ASSISTANT: Thank you for waiting Charlotte, we hardly tried to find your reservation but, no reservation has been found with your name.

USER: It's ok, I think my friend has been cancelled it, thank you very much for checking and great service.

ASSISTANT: Welcome, have a nice day.