You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I address you today?

USER: As I am a scientist, I want to attend science festival with my students at Las Vegas, LAS. Can you help me to book a ticket from Atlanta, ATL?

ASSISTANT: Sure, I will help you. May I know your travelling dates please?

USER: Dates are 05/12 and 05/14.

ASSISTANT: Ok, please wait for a moment.

USER: Sure.

ASSISTANT: Thanks for waiting, no flights found with your given details.

USER: No problem, I will check with another airline.

ASSISTANT: Ok, may I know your good name please for documentation purpose?

USER: Stephen Allen here.

ASSISTANT: Thanks for opting us.

USER: Thank you.