You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How can I help you today?

USER: My name is Ronald Lopez. Can you please book a flight ticket on dates 12/20 and 12/22?

ASSISTANT: Sure, I am here to help you in booking. Can you please share your travelling airport codes?

USER:  My airport codes are BOS and LGA.

ASSISTANT: Do you have any airline preference?

USER: Yes, I am comfortable with normal cost airline.

ASSISTANT: Let me know your departure time and arrival time.

USER: I am comfortable to travel at any time.

ASSISTANT: Do you have any specification?

USER: I need a connecting flight.

ASSISTANT: Sorry, no flights are available on your preferable travel dates.

USER: That's ok, thank you for the response.

ASSISTANT: Thank you for reaching us, have a nice day.