You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello,.

USER: Can you please changing my recent reservation? As my exam has been postponed.

ASSISTANT: Please provide your name.

USER: Sure, my name is Kenneth Lee.

ASSISTANT: Reservation found. Could you provide your journey dates.

USER: Sure, my journey dates are from 05/20 to 05/22.

ASSISTANT: May I know your journey codes.

USER: Sure, My airport codes are from IAH to LAX.

ASSISTANT: Connecting flight can be booked with airline Frontier having flight number 1020. Shall I book a ticket?

USER: Ok, proceed with booking.

ASSISTANT: Ticket is booked with price 100.

USER: Thank you.

ASSISTANT: Thanks.