You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Samuel Anderson.

ASSISTANT: How may I help you?

USER: As my meeting got postponed at Chicago, can you please help me by changing my existing reservation?

ASSISTANT: Sure, I can help you with that. Please let me check your reservation status first.

USER: Thank you for your positive response.

ASSISTANT: Samuel, I found your reservation details. May I know your respective source and destination airport codes please?

USER: My nearest airport codes of journey are from AUS to ORD.

ASSISTANT: Sure, may I know your planned travel dates please?

USER: My planned dates of journey are from 03/01 to 03/03.

ASSISTANT: Ok, please wait for a while.

USER: Sure, I will wait for your response.

ASSISTANT: Southwest airlines is having a flight on that route with ticket fare of 100, shall I proceed for booking?

USER: Please book my ticket with this airlines.

ASSISTANT: I have successfully booked your ticket with flight-1013, have a safe journey.

USER: Thank you for booking my ticket.

ASSISTANT: Thank you for choosing us.