You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I help you?

USER: John Miller here. I want to book a flight on the route from IAD - IAD for my round trip, can you help me?

ASSISTANT: Sure, could you please share your journey dates?

USER: I will be travelling from 07/26 to 07/28.

ASSISTANT: There is a flight-1020 of Delta airlines is available for you, shall I proceed?

USER: Ok, sure.

ASSISTANT: Ok, your booking is done.

USER: Thank you for booking my reservation.

ASSISTANT: Welcome.