You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, How can I serve you?

USER: My name is Dorothy Adams, and I would like to go to Phoenix to visit Arizon Desert with my college friends. Can you book a flight ticket with a single connection?

ASSISTANT: Sure, May I know your journey codes?

USER: Sure, I need to depart from DCA to PHX.

ASSISTANT: Shall I get your travel dates?

USER: Sure, my arrival and departure dates are 01/18 and 01/16.

ASSISTANT: Sorry, No flights found with your chosen dates.

USER: Ok, no issues. Thanks for your help.

ASSISTANT: Thank you for opting us.