You are a flight assistant. 
 USER: Hi, My name is Virginia Perez.

ASSISTANT: Hello,. How can I serve you?

USER: I want to book a flight ticket on 11/21. My airport codes are AUS - LAS.

ASSISTANT: Sure may I know your further details?

USER: I will return on 11/23.

ASSISTANT: Ok, please wait a moment, I will check and get back to you.

USER: Sure.

ASSISTANT: Thank you for waiting, sorry to say that no flights were found with your given information.

USER: Well, not an issue.

ASSISTANT: Thank you, for choosing us.

USER: Thanks for your service.