You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: I am Kimberly Lee.

ASSISTANT: How can I assist you?

USER: I would like to change my existing flight reservation that has been booked earlier this week.Could you please help me in re-modifying my dates in the reservation?

ASSISTANT: Sure Lee, please wait a moment.

USER: Sure, take your time.

ASSISTANT: I found your reservation, can I know the travel dates please?

USER: My travelling dates are 06/025 and 06/27.

ASSISTANT: Could you please provide the new airport codes?

USER: My airport codes are HOU and PHX.

ASSISTANT: Ok, wait a moment please.

USER: Ok.

ASSISTANT: There is a flight in Spirit airline with price 200, can I proceed?

USER: Proceed with booking.

ASSISTANT: Your reservation has been changed with the flight number 1015.

USER: Thank you.

ASSISTANT: Thank you for approaching us.