You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you?

USER: I want to change my reservation as my trip dates are postponed. Can you help me with that?

ASSISTANT: Please may I know your name.

USER: My name is Virginia Clark.

ASSISTANT: Please share your desired travel dates. There is a reservation on your name.

USER: I will travel on Nov 13 and return on Nov 15.

ASSISTANT: May I know your preferred airport codes?

USER: My source point is PHX and my destination is JFK.

ASSISTANT: Do you have any specifications?

USER: I want a connecting flight and return flight in afternoon.

ASSISTANT: Sorry to say, there is no flight on your desired travel dates.

USER: Ok, thank you for the information.

ASSISTANT: Thank you for opting us.