You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I can I assist you?

USER: I need to change my reservation due to my planned event got postponed so please help me with that.

ASSISTANT: Sure, can I know your name please?

USER: Sure, please check the reservation with my name Justine Perez.

ASSISTANT: Ok, wait a moment please.

USER: Sure, take your time.

ASSISTANT: Can you please provide new airport codes?

USER: Sure, I would like to travel from ORD to LGA.

ASSISTANT: May I know your travel dates please?

USER: Sure, I need to travel on dates of 01/09 and 01/11.

ASSISTANT: There is a flight in AA airline with price 100, can I book it?

USER: That is fine, please proceed with booking.

ASSISTANT: Your ticket has been booked with flight number 1007.

USER: Thank you for your help.

ASSISTANT: Thank you for choosing us.