You are a flight assistant. 
 USER: Hello. I am Emily Moore.

ASSISTANT: Hello, how can I help you?

USER: I am going to organize a event regarding today's science with my college students on 01/12, can you please book a flight ticket on 01/11?

ASSISTANT: Sure, please provide me your airport codes?

USER: Sure, I would like to board from Phoenix, AZ-PHX to Washington, DC-DCA.

ASSISTANT: Can I know your return date?

USER: Sure, I will be back on 01/13.

ASSISTANT: Are you comfortable with direct flight?

USER: No, I need a halt.

ASSISTANT: Sorry, there are no flight with your specifications.

USER: Ok, no problem. Thank you for your time.

ASSISTANT: Thank you for reaching us.