You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, do you need any help from us?

USER: I'm planning to attend get together party, can you please book the ticket from SEA to LAS?

ASSISTANT: Ok, may I know your trip dates?

USER: Sure, I would like to depart from my source location on 26th Sept and I want to return back by 28th Sept.

ASSISTANT: Ok, could I have your name please?

USER: My name is Donald Brown.

ASSISTANT: Ok, do you need direct or connecting flight?

USER: I prefer single connected flight to travel.

ASSISTANT: Ok, do you have any other specifications?

USER: I want to depart in the morning time.

ASSISTANT: Sorry, there is no flight on your requested travelling dates.

USER: Oh! That's ok, thank you for giving the information anyways.

ASSISTANT: You are welcome.