You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: Anna King here.

ASSISTANT: How may I help you?

USER: Can you please help me in booking the ticket from HOU to LAS?

ASSISTANT: Sure, I will help you with that. Could you provide me your travelling dates?

USER: Sure, my travel dates are 02/19 and 02/21.

ASSISTANT: Sorry to say that, there are no flight's available based on your travelling dates.

USER: That's ok, thank you for giving the information.

ASSISTANT: Thank you for reaching us.