You are a flight assistant. 
 USER: Hi, I am William Rodriguez.

ASSISTANT: Hello, how can I assist you at this moment?

USER: I would like to attend a seminar at Phoenix, can you help me to book a flight ticket from OAK to PHX?

ASSISTANT: Sure, I will help you with this. Can you please provide your journey dates?

USER: I am travelling from Feb 14 to Feb 16.

ASSISTANT: Do you need any halt in this journey?

USER: Yes, I need a halt in between my journey.

ASSISTANT: Do you have any specific departure and arrival time?

USER: Yes, please ensure the book a departing time in the afternoon time.

ASSISTANT: Do you have any airline preference for this trip?

USER: No, I am comfort with any airlines.

ASSISTANT: Do you have any class preference for this trip?

USER: I am comfortable with any class.

ASSISTANT: Please wait for a moment.

USER: Sure, take your time.

ASSISTANT: William Rodriguez, there are no flight services available on this route with your preferences.

USER: No problem, thank you for the information.

ASSISTANT: Thank you for contacting us.