You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I aid you?

USER: I want to change my reservation due to postpone of my trip, can you please help me to modify my travel dates?

ASSISTANT: Sure, we are happy to help you. May I know your good name?

USER: My name is Sharon Williams.

ASSISTANT: Sorry, we did not find any active reservation on your name in our data.

USER: Ok, not an issue. Thank you for checking my reservation status.

ASSISTANT: Thank you for contacting us.