You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I assist you?

USER: Could you please help me to book a flight ticket from LGA to EWR?

ASSISTANT: May I know your travel dates?

USER: My trip dates are Apr 12 and Apr 14.

ASSISTANT: Do you prefer connecting flight?

USER: I need  a single connecting flight.

ASSISTANT: Do you have any other specifications?

USER: I want to return in the evening.

ASSISTANT: May I know your good name?

USER: I am Andrew Hall.

ASSISTANT: Sorry, no flights are available in this route as per your requested dates.

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

ASSISTANT: Thank you for reaching us.