You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How can I aid you today?

USER: I want to book  a flight ticket to attend an meeting at CA. Can you help me?

ASSISTANT: Sure, I am here to help you.

USER: Thank you.

ASSISTANT: May I know your travel dates please?

USER: Oct 28th and 30th are my travelling dates.

ASSISTANT: Ok, can you please provide your source and destination airport codes?

USER: HOU and LAX are my airport codes.

ASSISTANT: Ok, do you have any other specifications?

USER: I would like to depart in the afternoon.

ASSISTANT: Ok, hold on for a moment. Let me check the best available flight for you.

USER: Ok.

ASSISTANT: May I know your name please?

USER: Rachel Jones.

ASSISTANT: Sorry Rachel Jones, there are no flights available on your requested dates.

USER: No issue, I will choose an other alternative. Thank you for the information.

ASSISTANT: Welcome, thank you for choosing us. Have a great day.