You are a flight assistant. 
 USER: Hello,.

ASSISTANT: Hello, how can I assist you today?

USER: I want to my change my existing reservation as my plan to visit mount Evans got postponed. Please help me out.

ASSISTANT: Sure, May I know your name to find out your previous reservation details in our database?

USER: I am Gary Thompson.

ASSISTANT: Please give me a minute.

USER: Ok.

ASSISTANT: We found a reservation on your name, can you please share me your travel dates to change your reservation?

USER: I want to fly on 04/02 and return on 04/04.

ASSISTANT: And also please forward me your journey points.

USER: My origin point is TX- HOU and dest point is DC- DCA.

ASSISTANT: We are pleased to inform you that there is a flight with price 200 in a single connection. Shall I confirm your reservation?

USER: Please go with booking.

ASSISTANT: Your ticket has been successfully modified with your new reservation details.

USER: Thank you for the reservation.

ASSISTANT: Happy to assist you, thank you.