You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: My name is Jessica Anderson.

ASSISTANT: How can I assist you today?

USER: I would like to attend my brother's anniversary in Dallas, can you help me for booking a flight ticket from BOS to DTW?

ASSISTANT: Sure, I will help you in booking. Can you please share your travel dates?

USER: My travelling dates are 12/13 and 12/15.

ASSISTANT: Sorry, no flights are available on your route.

USER: That's ok, thank you for checking.

ASSISTANT: Welcome, have a nice day.