You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I help you?

USER: I would like to book a ticket from BOS to SFO, can you please help me out?

ASSISTANT: Sure, I am glad to help you. Could you please share your travel dates?

USER: I am travelling on these dates Dec 29th and 31st.

ASSISTANT: May I know your name?

USER: Dorothy Roberts here.

ASSISTANT: Do you have any connection limit?

USER: I need single connected flight.

ASSISTANT: Is there any preferences?

USER: I prefer normal- cost flight.

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

USER: Ok no problem, thank you for your services.

ASSISTANT: Thank you for reaching us.