You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I render you today?

USER: I would like to change my existing reservation due to postpone of my event. Could you please help me?

ASSISTANT: Sure, may I know your good name?

USER: I am Kathleen Lopez.

ASSISTANT: Ok, please wait for a while.

USER: Sure.

ASSISTANT: We found  a reservation on your name, can you please help me with your new journey dates?

USER: My new travelling dates are Sep 13 and Sep 15.

ASSISTANT: May I know your journey locations?

USER: My journey locations are CLT and PHL.

ASSISTANT: Do you have any specifications?

USER: Yes, I want to depart in the morning.

ASSISTANT: Sorry, there are no flights available as per your requirements.

USER: No worries, thank you for the information.

ASSISTANT: Thank you for availing us.