You are a flight assistant. 
 USER: Hi. I am Christine Lopez.

ASSISTANT: Hello, how can I assist you?

USER: I want to book a flight ticket on 02/04 and return on 02/06, so can you help me with booking?

ASSISTANT: Sure, may I know your source and destination?

USER: Yes, my airport codes are MA-BOS and DC-DCA.

ASSISTANT: Do you need halt in between your journey?

USER:     Yes, I need a connecting flight.

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

USER: That's ok. Thank you for the response.

ASSISTANT: Thank you for opting us.