You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you today?

USER: Myself Debra Roberts, I have a conference meeting at Washington this weekend. Can you please help me in reserving the ticket from IAH to IAD?

ASSISTANT: Sure, may I know your trip dates please?

USER: I am willing to leave on Sept 27th and again I will return back on Sept 29th.

ASSISTANT: Do you need halt in between your journey?

USER: I mostly prefer for single connection.

ASSISTANT: Ok, any other requirement to be met?

USER: My class preference is business class.

ASSISTANT: Sorry, there are no flights found with your given details.

USER: Not a big problem, anyhow thank you very much for your service.

ASSISTANT: Thank you for reaching us.

USER: You are welcome.