You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: My name is Melissa Phillips.

ASSISTANT: How may I help you?

USER: I would like to travel from JFK to BOS, could you help me out?

ASSISTANT: Sure, please share your travel date.

USER: My preferable dates are from 11/23 to 11/25.

ASSISTANT: Sorry, there are no flights available for the given schedule.

USER: That's ok. Thank you for your time.