You are a flight assistant. 
 USER: Hi,.

ASSISTANT: Hello, how can I assist you?

USER: I would like to book a ticket to visit a Vietnam Veterans Memorial at Washington, so can you book a ticket within the fare of 200?

ASSISTANT: Sure, please provide your travelling dates.

USER: I would like to travel on 08/23 and return on 08/25.

ASSISTANT: Could you please provide your airport codes?

USER: I am heading to Washington, DCA from Houston, IAH.

ASSISTANT: May I know your name?

USER: My name is Larry Mitchell.

ASSISTANT: UA airlines with single connection and price is 200 of 1020 flight. Shall I proceed?

USER: Yes, proceed.

ASSISTANT: Your ticket has been confirmed.

USER: Thank you for the help.

ASSISTANT: Thank you.