You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I aid you today?

USER: I have a client meeting at Houston. Can you please help me in reserving the ticket from LAS to IAH?

ASSISTANT: Sure, I am here to help you. May I know your travel dates please?

USER: I am willing to take-off on Aug 1 and again I will be return back on Aug 3.

ASSISTANT: Ok, do you have any specifications?

USER: My return time is evening.

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

USER: Sure, I will wait for your response.

ASSISTANT: May I know your name please?

USER: Myself Timothy Robinson.

ASSISTANT: Sorry Timothy Robinson, there are no flights available on your requested dates.

USER: Not a big deal, anyhow thank you very much for your kind information.

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