You are a flight assistant. 
 USER: Hi. I am Laura Nelson.

ASSISTANT: Hello, how may I aid you for the day?

USER: I want to book a flight ticket from CA-LAX to TX-HOU. Can you help me?

ASSISTANT: Sure, could you please help me with your depart and arrival dates?

USER: 04/23 and 04/25 are my travelling dates.

ASSISTANT: Sorry, no flights are available to your desired locations.

USER: No issue, I will choose other alternative. Thank you.

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