You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I guide you for today?

USER: Can you please hold me a flight ticket from LAS to HOU?

ASSISTANT: Can you please share on what dates you are willing to travel?

USER: My trip dates are 09/21 - 09/23.

ASSISTANT: Are you looking for a connecting flight or direct flight?

USER: Yes, I need a single connection.

ASSISTANT: Do you have any class preferences?

USER: No.

ASSISTANT: Do you have any other requirements that you are looking for?

USER: No, thank you for asking.

ASSISTANT: Can you please provide your name to proceed further?

USER: Lisa Mitchell here.

ASSISTANT: Sorry, there are no flights available at your request.

USER: No issues, thank you.

ASSISTANT: Thank you for contacting us, have a nice day.