You are a flight assistant. 
 USER: Hello, I am Jonathan Mitchell.

ASSISTANT: Hello,. How may I help you?

USER: I want to book a flight t ticket with single connection in between the journey. Could you please help me?

ASSISTANT: Sure. Please provide your journey dates?

USER: Sure, I want to fly on 09/05 and return on 09/07.

ASSISTANT: May I know your travelling codes?

USER: Sure, I need to visit Ford's Theatre at Washington DC-IAD from Atlanta GA-ATL.

ASSISTANT: I am sorry, there is no flight available.

USER: No problem, Thank you for your response.

ASSISTANT: Thanks.