You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you today?

USER: I am Larry King. I want to book a ticket from Atlanta to meet my old family friends, can you please book me a ticket?

ASSISTANT: Sure, can you please share your trip dates?

USER: My travel dates are from 07/15 to 07/17.

ASSISTANT: May know your airport codes please?

USER: My airport codes are from ATL to IAD.

ASSISTANT: Do you have any specifications?

USER: I need a halt.

ASSISTANT: Please wait for a while.

USER: Ok.

ASSISTANT: Sorry, there is no flights found on your given details.

USER: Ok, no problem. Thank you.

ASSISTANT: Thanks for choosing us.