You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I help you?

USER: I need to book a flight ticket from IAD to EWR, can you help me in booking a flight ticket?

ASSISTANT: Sure, please share your journey dates?

USER: Sure, my journey dates are Apr 12 and Apr 14.

ASSISTANT: Do you have any specifications?

USER: I prefer maximum one connection. And I would prefer depart time at morning.

ASSISTANT: May I know your good name?

USER: Sure, Joseph Lopez here.

ASSISTANT: Is there any specifications to be met?

USER: I prefer return time at evening.

ASSISTANT: Sorry, no flights found on your given details.

USER: Ok, no issues. Thank you for your assistance.

ASSISTANT: Thank you for choosing us.