You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: I am Dennis Martin.

ASSISTANT: How can I aid you Dennis?

USER: I am looking for booking a ticket to LAS, going to give a presentation of my story to a publisher at Las Vegas, can you please book a ticket?

ASSISTANT: Sure, I will help you. May I know your origin airport code?

USER: Sure, my origin airport code is BOS.

ASSISTANT: Can you please help me with your travel dates for booking flight ticket?

USER: Sure, I will start my journey on 09/14 and return on 09/16.

ASSISTANT: Ok, please wait a moment.

USER: Ok.

ASSISTANT: Sorry for the inconvince no flights available as per your requested dates?

USER: Ok, no problem, I will go by any other way. Thank you for your information.

ASSISTANT: Thank you Dennis for reaching us, have a nice day.