You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Frank Evans.

ASSISTANT: How can I assist you today?

USER: Can you please book a flight ticket from HOU to LAX?

ASSISTANT: Sure, I will help you. Can you please share your travel dates?

USER: Ok, my travel dates are 09/15 and 09/17.

ASSISTANT: Sorry, no flights are available on your route.

USER: Ok, not a problem. Thank you for helping me.

ASSISTANT: Thank you for choosing us.