You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I help you today?

USER: Could you please book a flight ticket in economy class?

ASSISTANT: Sure, let me know your travel dates please?

USER: My travel dates are Sept 18 and Sept 20.

ASSISTANT: Ok, can I know your airport codes?

USER: I am heading to LAX from LAS.

ASSISTANT: Do you have any other requirements to be met?

USER: I want to return in the morning. And I need a single connecting flight.

ASSISTANT: Ok, may I know your name please?

USER: My name is Larry White.

ASSISTANT: Sorry, no flights as per your request.

USER: Not a problem, thank you for the information.

ASSISTANT: Thank you for contacting us.