You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I serve you?

USER: Can you help me in booking a flight ticket to EWR from DTW in the month of May?

ASSISTANT: Sure, I will help you. Please send your travelling dates.

USER: Thank you for your concern. My travelling dates are May 11 and May 13.

ASSISTANT: Do you have any preferences?

USER: I need a connecting flight for my journey.

ASSISTANT: May I know your name?

USER: Ok, my name is Mary Harris.

ASSISTANT: Sorry, there is no flight available with your requirements.