You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I assist you for the day?

USER: Book a ticket with the name of Dennis Mitchell to Atlanta, ATL to conduct the Film festival.

ASSISTANT: Sure, I am here to help you.

USER: Ok.

ASSISTANT: When you are willing to travel?

USER: I have to fly on 04/19. And get back from Atlanta on 04/21.

ASSISTANT: Can you help me with your source code?

USER: Origin: Washington, DCA.

ASSISTANT: Please wait for a moment.

USER: Ok.

ASSISTANT: We found 1008 UA airlines with single connection with price 200.

USER: Confirm it.

ASSISTANT: Your booking has been confirmed.

USER: Thank you for aiding me.

ASSISTANT: Thank you for reaching us.