You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I help you?

USER: Can you please help me in booking a flight ticket to PHL from BOS?

ASSISTANT: Yes, can you tell me your dates of travel?

USER: My travel dates are from Apr 02 to Apr 04.

ASSISTANT: Do you have any other preferences?

USER: I need a connecting flight.

ASSISTANT: Give me a moment.

USER: Ok.

ASSISTANT: Sorry to inform you that there are no flights found on your requested dates.

USER: Ok, no problem. Thank you.