You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you today?

USER: I am Ashley Davis from Austin. I want to attend for my niece's marriage in Las Vegas, so please book a economy class flight ticket for me.

ASSISTANT: Sure, we are here to help you. Can you share me your travelling dates?

USER: I will start on 11/06, return on 11/08.

ASSISTANT: Let me know your airport codes?

USER: My source and destination airport codes are TX - AUS, NV - LAS.

ASSISTANT: Ok, wait for a moment.

USER: Sure.

ASSISTANT: Thanks for waiting there are no flights found on your details.

USER: No problem, thank you.

ASSISTANT: Thanks for approaching us.