You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you?

USER: I'm Stephanie Carter. I am planning to attend a sports event at Washington, can you please help me with booking a flight ticket?

ASSISTANT: May I know the airport codes with dates?

USER: Sure, it is from LAS to IAD. My departure date is on 09/09 and the return date is on 09/11.

ASSISTANT: There is a flight with number 1000 and connections are 2.

USER: I need a flight with 1 connection.

ASSISTANT: Sorry, there is no flight with 1 connection.

USER: Ok, no problem. Thank you for your help.

ASSISTANT: Welcome.