You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I amend you today?

USER: As I am a scientist, I want to attend science festival with my students at Phoenix.

ASSISTANT: Ok.

USER: Can you do the reservation?

ASSISTANT: Sure. May I have your trip dates?

USER: Dates are 10/31 and 11/02.

ASSISTANT: What are your airport codes?

USER: My airport codes are DCA-PHX.

ASSISTANT: Could you please share your name?

USER: William Clark here.

ASSISTANT: Do you have any other specifications?

USER: Price should not cross 5000. I need break in my journey.

ASSISTANT: Thanks for sharing your details. We found a UA airline based on your request. 1020 is your flight number. Shall I proceed to book?

USER: Go ahead.

ASSISTANT: Your reservation is done.

USER: Thank you so much.

ASSISTANT: Thank you.