You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I guide you today?

USER: I am Brian Parker. I want to book a flight ticket from BOS to PHX. Could you help me in booking?

ASSISTANT: Sure, I will help you with that. Can you please share your preferable journey dates?

USER: My travelling dates are from June 05-07.

ASSISTANT: Do you have any specifications?

USER: My depart time should be in the evening.

ASSISTANT: Do you have any class preference?

USER: No, I don't have any class preference.

ASSISTANT: I am sorry to sorry to say that there is no flight found under your details.

USER: That's ok, no problem. Thank you.

ASSISTANT: Thank you for reaching us, have a great day.