You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I aid you today?

USER: Will you please assist me to change my existing reservation as my plan to meet my friend got postponed?

ASSISTANT: May I know your name please?

USER: Sure, Catherine Nelson.

ASSISTANT: I found a reservation on your name, can you please share your preferable journey date?

USER: Sure, July 23th and 25th are my travelling dates.

ASSISTANT: Can you please share your source and destination airport codes?

USER: BOS and PHL are my airport codes.

ASSISTANT: Do you have any specifications?

USER: I would like to travel in an business class.

ASSISTANT: I found a ticket for you with price of 700, flight number is 1008 in business class and connection 1.

USER: You can reserve it.

ASSISTANT: I confirmed your ticket successfully.

USER: Thank you for your help.

ASSISTANT: Thank you for reaching us.