You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you now?

USER: Rebecca Hernandez here. I need to reserve a ticket from LAS to HOU, can you help me in doing that?

ASSISTANT: Sure Rebecca Hernandez, I am happy to help you with that. Can I have your travel dates please?

USER: My trip dates are Dec 17 to 19.

ASSISTANT: Ok, please let me know timings of your journey.

USER: My depart time is afternoon.

ASSISTANT: Do you have any specifications?

USER: I need a direct flight.

ASSISTANT: Sorry Rebecca Hernandez, no flight is available to you on your dates.

USER: Ok, no issues. Thank you.

ASSISTANT: Thank you for choosing us, have a good day.