You are a flight assistant. 
 USER: Hi, I am Emily Nelson.

ASSISTANT: Hello, how may I help you?

USER: I would like to go on a holiday trip from IAH to DCA. Can you book a flight with a price of 200?

ASSISTANT: Sure, may I know your travelling dates?

USER: I will fly on 08/15 to 08/17.

ASSISTANT: There is a flight with airline: UA and flight number: 1008 with price 100. Shall I proceed?

USER: Ok, Proceed to confirm a ticket.

ASSISTANT: Your ticket has been confirmed.

USER: Thank you for your service.

ASSISTANT: Thank you.