You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I aid you?

USER: Due to summer vacation, I need to visit my grandparents at Austin, TX - AUS. Can you book a flight ticket from Las Vegas, NV - LAS?

ASSISTANT: Sure, may I Know how much you can afford for this journey?

USER: I can afford 1000 for my ticket.

ASSISTANT: Ok, please help me with your travelling dates.

USER: 05/19 and 05/21 are my travelling dates.

ASSISTANT: Ok, may I know your name please?

USER: Dorothy Jones is my name.

ASSISTANT: Thank you, sorry to say no flights found with your details.

USER: Ok, no issues. Thanks for your information.

ASSISTANT: Have a nice day.