You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I assist you?

USER: I want to book a ticket from PHX to DFW. Could you book a ticket?

ASSISTANT: Sure, may I know your travel dates?

USER: Travel dates are Apr, 14 and Apr, 16.

ASSISTANT: Do you have any specifications?

USER: I would like to depart in the afternoon.

ASSISTANT: May I know your name?

USER: Myself Donald Evans.

ASSISTANT: Ok, please wait a minute.

USER: Sure.

ASSISTANT: Sorry, there were no flights found on your route.

USER: Thank you.

ASSISTANT: Thank you.