You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I help you?

USER: Susan Martinez here. I would like to visit Seattle for a business conference, can you please help me out with booking of a flight ticket?

ASSISTANT: Sure, could you please let me know your journey dates?

USER: I am planning to move on 04/26 and please book my return ticket on 04/28.

ASSISTANT: May I know your source and destination airport codes?

USER: Sure, I want to travel from IAD to SEA.

ASSISTANT: There is a connecting flight-1026 of UA airlines, shall I proceed?

USER: If it is single connected flight, you can proceed with booking.

ASSISTANT: Ok, your booking is done.

USER: Thank you for your help in booking of my ticket.

ASSISTANT: Welcome.