You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you?

USER: Myself Dorothy Adams.

ASSISTANT: Hello Dorothy.

USER: I want to change my existing reservation.Could you please help me out?

ASSISTANT: Sure, please give me amoment.

USER: Ok.

ASSISTANT: I found your reservation, please share your new airport codes and new dates of travel.

USER: Sure, my trip dates are from 11/02 to 11/04. My airport codes are from IAD to ORD.

ASSISTANT: Please give me a moment.

USER: Sure.

ASSISTANT: There is a flight available with UA airlines, shall I book it?

USER: Ok, please book my ticket.

ASSISTANT: Your ticket is confirmed, flight number is 1026.

USER: Thank you for your help.

ASSISTANT: Thank you for reaching us.