You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: Myself Anna Lopez.

ASSISTANT: How can I assist you today?

USER: I want to go Austin next week to meet my friends there, can you please book a flight ticket from Las Vegas?

ASSISTANT: Sure, will you mention your travelling dates please?

USER: I want to departure on 03/21 and also confirm my return ticket also on 03/23.

ASSISTANT: Please provide your airport codes that you want to travel.

USER: I want to fly from LAS and destination airport is AUS.

ASSISTANT: Please give me a moment.

USER: Ok.

ASSISTANT: There is no flights found under your requirements.

USER: Oh! It's ok no problem, I will go with another airline service. Thank you for your information.

ASSISTANT: Welcome, have a great day.