You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I help you?

USER: Can you help me book a flight ticket from Philadelphia, PA - PHL to meet my client at Boston, MA - BOS?

ASSISTANT: Sure, may I know your travel dates please?

USER: My dates of travel are 12/09 and 12/11.

ASSISTANT: Thanks for your patience. I have found AA airlines which flies with one connection. Can I book the flight ticket?

USER: No, I need a direct flight.

ASSISTANT: Sorry presently there is no direct flight available.

USER: It's ok, thank you.

ASSISTANT: Thank you.