You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I assist you today?

USER: Please search a flight ticket from EWR to BOS?

ASSISTANT: Sure, may I know your travelling dates?

USER: My travelling dates are Mar 23 and Mar 25.

ASSISTANT: Do you have any connection limit?

USER: I need single connection flight.

ASSISTANT: May I know your class preference?

USER: I prefer business class ticket.

ASSISTANT: Please mention your time specification?

USER: I need my return ticket at evening time.

ASSISTANT: Do you have any other specifications?

USER: I am planning to fly in normal cost airline.

ASSISTANT: May I know your name?

USER: Myself Anna Brown.

ASSISTANT:  Sorry, there are no flight tickets available on your journey dates.

USER: Ok, thank you for checking.

ASSISTANT: Thank you for reaching our service.