You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I aid you?

USER: I want to travel from BOS to EWR. Can you help me to book a flight ticket?

ASSISTANT: May I know your trip dates?

USER: I want to travel in the flight on Dec 20 and Dec 22.

ASSISTANT: Do you have any other requirements to be met?

USER: I want to travel in a connecting flight.

ASSISTANT: Can I have your name please?

USER: Shirley White.

ASSISTANT: Sorry to inform you that unfortunately there is no flights available by the given details.

USER: That's ok. Anyways, thank you.

ASSISTANT: Thank you.