You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I aid you?

USER: Can you please make a reservation from LAS to BOS to attend a meeting in Boston?

ASSISTANT: Sure, can you please let me know your trip dates?

USER: My journey dates are on Dec 18th and  Dec 20th.

ASSISTANT: Do you have any connection limit preference?

USER: I need a direct flight.

ASSISTANT: Could you help me with your name please?

USER: My name is Nancy Martinez.

ASSISTANT: Sorry, there is no flight available for the mentioned dates.

USER: Ok, no problem. Thank you.

ASSISTANT: Thank you for reaching us.