You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I guide you today?

USER: Can you please help me in changing my existing reservation, as my exam got postponed?

ASSISTANT: Sure, I will help you with that.

USER: Ok.

ASSISTANT: Can you please share your name?

USER: Check under the name Kimberly Jackson.

ASSISTANT: I found a reservation, can you please share your journey dates?

USER: My trip dates are Sep 20 to Sep 22.

ASSISTANT: Can you please share your airport codes?

USER: I will start from SFO to ORD.

ASSISTANT: Do you have any connection limit?

USER: I am looking for a stopover which return in evening.

ASSISTANT: I found flight for you with price of 100, flight number is 1003 in economy class and connection is 1.

USER: You can reserve it.

ASSISTANT: I confirmed your ticket successfully.

USER: Thank you.

ASSISTANT: Thank you for reaching us.