You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, How can I assist you?

USER: I want to fly from EWR to DCA. Can you book a ticket from that route?

ASSISTANT: Sure, May I know the travelling dates?

USER: My planned travel dates are 09/13 and 09/15.

ASSISTANT: Do you have any connection limit?

USER: I want a flight with single connection.

ASSISTANT: Is there any other requirements?

USER: No more, thank you. Sure, Gregory Hall here.

ASSISTANT: Please wait a minute.

USER: Sure.

ASSISTANT: Sorry, No flights found with your chosen dates.

USER: No issues, thank you for the information.

ASSISTANT: Thank you for opting us.