You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I aid you?

USER: I need to travel from IAD to EWR as a business trip, can you help me to make a reservation?

ASSISTANT: Please provide your journey dates.

USER: I will start on Mar, 23 and return on Mar, 25.

ASSISTANT: Do you need any connection limit?

USER: I would prefer single connection.

ASSISTANT: Do you have any other specifications?

USER: I need to return at evening time.

ASSISTANT: May I know your name?

USER: Ronald Martin here.

ASSISTANT: There are no flights available on your routes.

USER: Not a problem, thank you for the information.

ASSISTANT: Thank you for choosing us.