You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How best can I guide you now?

USER: I want to travel to DEN, can you book a flight ticket from LGA?

ASSISTANT: Sure, I am here to help you. May I know your travel dates, please?

USER: My travel dates are 03/19 and 03/21.

ASSISTANT: Do you have any connection preference for your journey?

USER: I prefer to travel on a single connecting flight.

ASSISTANT: May I know your class preference, please?

USER: I don't have any preference regarding class.

ASSISTANT: Do you have any other specifications?

USER: No, thanks for asking.

ASSISTANT: Let me know your name to proceed for documentation purpose.

USER: Sandra Jackson here.

ASSISTANT: Sorry for the inconvenience, there are no flights available as per your requirements.

USER: That's ok, thank you for your information.

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