You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you today?

USER: Please help me to book a flight ticket from PHX to EWR.

ASSISTANT: Sure, can I know your travelling dates?

USER: My travel dates are from Nov, 16 to Nov, 18.

ASSISTANT: Do you have any other preferences?

USER: I need a single connecting flight in an economy class.

ASSISTANT: Can I know your flight timing?

USER: I need to depart in the morning and I need to return in the afternoon.

ASSISTANT: May I know your name?

USER: I am Donald Hernandez.

ASSISTANT: Sorry, there are no flights available on your travelling dates.

USER: No problem, thanks for your information.

ASSISTANT: Thank you for choosing us.