You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I assist you now?

USER: I want to attend my convocation ceremony, so please book my ticket from BOS to PHX.

ASSISTANT: Sure, I am glad to help you with that. Can you please provide your preferable dates of travelling?

USER: My itinerary dates are June 27 and June 29.

ASSISTANT: May I know your name to book the flight ticket?

USER: Timothy Baker here.

ASSISTANT: Do you have any connection limit?

USER: I need a connecting flight.

ASSISTANT: At what time would you like to departure and return?

USER: I am comfortable to travel at any time.

ASSISTANT: Do you have any more specifications?

USER: I prefer to travel in economy class.

ASSISTANT: Please wait a moment to check the flights.

USER: Sure.

ASSISTANT: We regret to inform you that, there are no flights moving to your region with your requested dates of travelling.

USER: No problem, thank you for helping me.

ASSISTANT: Thank you for reaching to our services, hope you have a great day.