You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I aid you today?

USER: Can you please help me in reserving the ticket from IAD to MSP?

ASSISTANT: Sure, can you please share your preferable journey dates?

USER: I would like to travel on Aug 21 and again I will return back on Aug 23.

ASSISTANT: May I know your name please?

USER: Myself Amy Collins.

ASSISTANT: Do you have any other specifications?

USER: I want to travel in single connection flight.

ASSISTANT: I am sorry to say that there is no flight found.

USER: Not a big deal, anyhow thank you very much for your information.

ASSISTANT: Thank you for reaching us.