You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I aid you today?

USER: I am looking to book a flight ticket from BOS to PHX. Can you help me for that?

ASSISTANT: Sure, will your please provide your preferable dates of travelling?

USER: My travelling dates are Sep 19 and Sep 21.

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

USER: My name is George Hall.

ASSISTANT: Any connection limit do you have?

USER: I would prefer single connecting flight.

ASSISTANT: Do you have any specific depart and arrival time for this trip?

USER: No.

ASSISTANT: Any other preferences do you have?

USER: My airline preference is normal cost.

ASSISTANT: Please wait a moment.

USER: Sure, I will wait for your response.

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

USER: That's ok, thank you for checking.

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

USER: Welcome.