You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I aid you for the day?

USER: I am Ronald White. I want to change an existing reservation, due to sudden demise of my grand father. Can you please help me in that?

ASSISTANT: Sure, I will help you with that changing.

USER: Thank you.

ASSISTANT: Please hold for a moment, let me check your previous  reservation status.

USER: Sure, take your own time.

ASSISTANT: I have found your reservation. Can you please mention your airport codes?

USER: Sure, my airport codes are DEN toHOU.

ASSISTANT: Ronald White, may I know your journey dates please?

USER: Sure, I need to travel on dates of 10/19 and 10/21.

ASSISTANT: UA airlines are providing a connecting flight with the ticket price 200. Shall I proceed with this booking?

USER: Ok, you can proceed with that.

ASSISTANT: Ronald White, your booking is confirmed with flight number 1012.

USER: Thank you for your booking.

ASSISTANT: Thank you for contacting us, have a safe journey.

USER: You are most welcome.