You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I aid you today?

USER: I am planning to visit Seattle to attend a seminar, can you please book me a ticket from PHX to SEA?

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

USER: I would like to depart at Apr 19 and I prefer to return at Apr 21.

ASSISTANT: Ok, do you have any specifications?

USER: I prefer normal cost airline.

ASSISTANT: Ok, hold on for a moment. Let me check the best available flight for you.

USER: Sure, I will wait for your information.

ASSISTANT: May I know your name please?

USER: My name is Brandon Martinez.

ASSISTANT: Sorry Brandon Martinez, there are no flights available on your requested dates.

USER: Ok, not an issue. Thank you for providing information.

ASSISTANT: Welcome, thank you for choosing us. Have a great day.