You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you?

USER: I am looking to book a flight ticket from BOS to PHL. Can you help me for that?

ASSISTANT: Sure, can I know your travelling dates?

USER: My travelling dates are Dec 25 and Dec 27.

ASSISTANT: On which name should I reserve the flight ticket?

USER: My name is Helen Miller.

ASSISTANT: Do you have any connection limit?

USER: I need a single connecting flight.

ASSISTANT: Do you have any other specifications?

USER: No.

ASSISTANT: Sorry, there are no flights found on given dates.

USER: That's ok, thank you for checking.

ASSISTANT: Thank you for reaching us.

USER: Welcome.