You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you today?

USER: I am Elizabeth Green.

ASSISTANT: Nice to meet you Elizabeth.

USER: I am planning to visit Denver Zoo in DEN, can you help me in booking a ticket from DCA?

ASSISTANT: Sure, may I know your travelling dates please?

USER: My planning dates are from 06/14 to 06/16.

ASSISTANT: There is a flight available on your requested dates in Delta airline with 1 connection. Can I proceed your booking with this airline?

USER: That's good to hear, please proceed in booking my ticket.

ASSISTANT: Ok, your ticket is booked with the flight number 1012.

USER: Thank you for your help.

ASSISTANT: It's my pleasure to help you.