You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I help you?

USER: Please help me in booking flight ticket to attend an event in DEN.

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

USER: My trip dates are June 18 to June 20.

ASSISTANT: Could you please share me your source airport code?

USER: My source airport code is LAS.

ASSISTANT: May I know your connection limit?

USER: I am okay with any flight.

ASSISTANT: Do you need any other preference?

USER: My return should be in the afternoon.

ASSISTANT: Can I know your name please?

USER: Jessica Thomas.

ASSISTANT: Sorry to inform you that there are no flight services available on your given details.

USER: Ok, no problem. Thank you.

ASSISTANT: Thank you for contacting us.