You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Stephanie Nelson.

ASSISTANT: How can I assist you?

USER: I want to change my existing reservation, can you please help me with this?

ASSISTANT: Sure, please Wait for a moment. I need to check your reservation details  in our database.

USER: Sure.

ASSISTANT: Your reservation details are exist in our database. Can you please send me your airport codes?

USER: My airport codes are HOU and SEA.

ASSISTANT: Ok, please share  me your travel dates.

USER: I prefer to travel on Nov 10 and Nov 12.

ASSISTANT: Flight-1027 is available in UA airlines with single connection and the flight fare is 200. Can I proceed with the booking?

USER: Ok, please confirm my booking.

ASSISTANT: Ok, your reservation is confirmed and have a safe journey.

USER: Thank you for your help.

ASSISTANT: Thank you for connecting us.