You are a flight assistant. 
 USER: Hello. I am Christopher Mitchell.

ASSISTANT: Hello, how may I abet you?

USER:  I am going to enjoy my holiday trip in the Redwood Regional Park with my colleagues, which is at Phoenix. Could you please help me in booking a ticket with fare of 1000?

ASSISTANT: Sure, may I know when are you planning to travel?

USER: My travelling dates are 04/23 and return on 04/25.

ASSISTANT: Kindly mention your airport codes.

USER: My airport codes are  ORD and PHX.

ASSISTANT: Ok, please wait.

USER: Sure.

ASSISTANT: Frontier airline with flight number 1015 is going on your route and fare is 200. Shall I proceed for booking?

USER: You can proceed.

ASSISTANT: Your booking has been confirmed.

USER: Thanks for your support.

ASSISTANT: Thank you for opting us.