You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How could I serve you?

USER: Can you please help me to book a ticket from EWR to BOS?

ASSISTANT: Sure, to book a ticket may I know your travelling dates?

USER: I want to start on Jan 17 and return on Jan 19.

ASSISTANT: Do you have any other requirements?

USER: I need a direct flight.

ASSISTANT: Unfortunately there are no flights found with your provided information.

USER: Ok, not an issue. Thank you.

ASSISTANT: Thank you for reaching us.