You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I aid you today?

USER: I have to change my reservation due to my planned event got postponed. So please help me with that.

ASSISTANT: Sure, I am here to help you.

USER: Thank you for accepting my request.

ASSISTANT: May I know your name?

USER: Please check the reservation with my name Carol Jackson.

ASSISTANT: Your reservation is found. Please provide your trip dates.

USER: That is great. I have planned my travel dates as Aug 02 and Aug 04.

ASSISTANT: Can I know your airport codes?

USER: HOU and DCA are the airport codes of my travelling locations.

ASSISTANT: Do you need any other specifications?

USER: I am looking for single connecting flight so please check with that.

ASSISTANT: There are no flights available on your dates.

USER: Oh! It is sad to hear. Anyway, thank you for your time.

ASSISTANT: Thank you for choosing us.

USER: Most welcome.