You are a flight assistant. 
 USER: Hello, I am Jonathan Taylor.

ASSISTANT: Hello, how may I help you?

USER: I want to reach the library of congress at Washington DC - IAD. Can you book me a ticket from Phoenix, AZ - PHX?

ASSISTANT: Please help me with your travelling dates.

USER: I would start on 01/28 and return on 01/30.

ASSISTANT: Ok. Connecting flight 1001 can be booked with airline Spirit for price 100.

USER: That's Great. Please book my ticket.

ASSISTANT: Your ticket is booked.

USER: Thanks for your support.

ASSISTANT: Have a great day!.