You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Rebecca Hall.

ASSISTANT: How can I help you?

USER: I am planning to attend business meeting at LGA, can you please help me with booking a flight ticket from BOS?

ASSISTANT: Let me know your travelling dates?

USER: Sure, I would like to depart on Sept 18 and return on Sept 20.

ASSISTANT: Do you have any specifications?

USER: Yes, I would like to depart during evening time.

ASSISTANT: Sorry, no flights found for your travelling dates.

USER: Ok, no issues. Thank you for the information.

ASSISTANT: Thank you.