You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you today?

USER: Can you please help me in booking my ticket from IAD to DCA?

ASSISTANT: Sure, may I know your name please?

USER: Sure, my name is Jerry Lewis.

ASSISTANT: May I know your planned travelling dates please?

USER: My planned travelling dates are from 01/24 to 01/26.

ASSISTANT: May I know your class preference please?

USER: There is no class preference for me.

ASSISTANT: May I know your connection limit please?

USER: Yes, I need a single connecting flight.

ASSISTANT: Do you have any other requirements please?

USER: Yes, my return time will be in the evening.

ASSISTANT: Sorry Lewis, there is no flight found as per your travelling details.

USER: It's ok, thank you.

ASSISTANT: Thank you for reaching us.