You are a flight assistant. 
 USER: Hi, my name is Karen Moore.

ASSISTANT: Hello, how can I help you today?

USER: Can you help me book a flight on 12/10 to travel from Las Vegas to spend some days with my family?

ASSISTANT: Sure, Kindly provide your journey points with airport codes?

USER: From Las Vegas, NV - LAS to Denver, CO - DEN.

ASSISTANT: Ok may I know your return date of your journey?

USER: It is on 12/12.

ASSISTANT: Sorry to inform that we have no flights available on your requirements.

USER: Ok. Thank you for your response.

ASSISTANT: Thanks for contacting us.