You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I aid you at present?

USER: As I am a scientist, I want to attend science festival with my students at Dallas. Can you do the reservation?

ASSISTANT: Sure, let me know your preferred journey dates.

USER: My trip dates are 12/25 and 12/27.

ASSISTANT: Ok, Can you please share your travelling airport codes?

USER: My airport codes are AUS-DFW.

ASSISTANT: Sure, may I know your budget?

USER: I can spend money for a ticket maximum 200.

ASSISTANT: Ok, please wait for a moment.

USER: Sure.

ASSISTANT: Thanks for your time, there were no flights found based on your requested dates.

USER: No problem, Thanks for the information.

ASSISTANT: May I know your name for documentation?

USER: Cynthia Rodriguez here.

ASSISTANT: Ok. Thank you for choosing us.