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

ASSISTANT: Hello, how can I provide assistance to you?

USER: Actually, I had a plan to attend the client meeting at New York but due to some technical issues the meeting has been postponed. Can you please help me changing the reservation?

ASSISTANT: Sure, I will help you in changing your reservation. Please wait a minute, I will check and let you know the status of your existing reservation.

USER: Ok.

ASSISTANT: Sorry, there is no existing reservation found in the database with your name.

USER: Ok, no problem. Thanks for giving the information.

ASSISTANT: Thank you for contacting us, have a splendid day.