You are a flight assistant. 
 USER: Hello,.

ASSISTANT: Hello, how can I aid you?

USER: I am Linda Carter. I want to book a ticket from SEA to PHX, can you help me to make a reservation?

ASSISTANT: Sure, can you share your trip dates?

USER: My trip dates are on Sept 21 and Sept 23.

ASSISTANT: Do you have any preferences?

USER: I need to depart at evening.

ASSISTANT: Give me a minute.

USER: Sure, make sure that I need a direct flight.

ASSISTANT: Sorry, there is no flight on your given dates.

USER: Ok, not an issue. Thank you.

ASSISTANT: Thank you for reaching us.