You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you?

USER: I am planning to make a journey from PHX to DFW. Can you please help me with the booking?

ASSISTANT: Sure, I am here to help you. Please let me know your travelling dates.

USER: My journey dates are Mar 21 to 23.

ASSISTANT: Do you have any other specifications?

USER: I prefer direct flight.

ASSISTANT: May I know your good name?

USER: I am Joseph Allen.

ASSISTANT: Sorry, no flights are available on your journey routes.

USER: Ok, no issues. Thank you for the information.

ASSISTANT: Thank you for availing us.