You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I help you?

USER: I am Dorothy Roberts want to go for shopping at IAD, can you book a ticket from DCA?

ASSISTANT: Sure, can you please let me know your planned dates to search a flight?

USER: Sure, my travelling dates will be 08/16 and 08/18.

ASSISTANT: There is a flight-1010 of UA airlines, shall I proceed?

USER: Yes, proceed.

ASSISTANT: Ok, your booking is done.

USER: Thank you.

ASSISTANT: Welcome.