You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How can I assist you for the day?

USER: I need to book a ticket from PHX to OAK. Could you book a ticket?

ASSISTANT: Sure, I am here to help you with that. May I know your planned travel dates?

USER: Departure is on Mar, 31 and return date is Apr, 2.

ASSISTANT: Do you have any particular time for departing and returning?

USER: I am comfortable to travel any time.

ASSISTANT: May I know your name please?

USER: My name is Benjamin Williams.

ASSISTANT: Do you have any other specifications?

USER: I would be comfortable with single stop over.

ASSISTANT: There are no flights found on this route as per your travel dates.

USER: Thank you.

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