You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: Donald Harris here.

ASSISTANT: Good morning Harris. How can I assist you at this moment?

USER: Good morning, I would like to visit Los Angels for a business trip, can you please help me out with booking of flight ticket?

ASSISTANT: Sure, I will help you with booking.

USER: Thank you.

ASSISTANT: Can I have your travel dates please?

USER: Sure, I am planning to go on 09/07 and please book a return ticket also on 09/09.

ASSISTANT: Ok, please provide me airport codes of your locations.

USER: I want to travel from ATL to LAX.

ASSISTANT: Ok, please give me a moment let me check for flight availability.

USER: Sure, I will wait for your response.

ASSISTANT: Thank you for waiting.

USER: No problem.

ASSISTANT: Sorry Harris, no flight is available to you on your travel dates.

USER: Oh, sad to hear that. Anyway, I will choose another way to go there, thank you for the information.

ASSISTANT: My pleasure. Thank you for choosing us.

USER: Welcome.