You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Melissa Lewis.

ASSISTANT: How can I assist you today?

USER: Can you book a flight ticket from JFK to DCA to attend a food festival?

ASSISTANT: May I know your travelling dates?

USER: I will start on Nov, 4 and need to return on Nov, 6.

ASSISTANT: Do you need any connection limit?

USER: I need single connection.

ASSISTANT: Could you share me your depart and arrival time?

USER: My return time should be at evening.

ASSISTANT: If you have any other specifications let me know?

USER: No, thanks.

ASSISTANT: Sorry, no flights are available on your preferences.

USER: That's ok, not an issue.

ASSISTANT: Thank you for opting us.

USER: Thank you.