You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I assist you?

USER: Due to sudden change in my trip to another location, I would like to do some changes in existing my reservation. Can you please help me out?

ASSISTANT: Can I know your name?

USER: Nicole Miller here.

ASSISTANT: Change reservation found. Please provide your journey dates?

USER: Apr, 24 and Apr, 26 are my journey dates.

ASSISTANT: Could you let me know your airport codes?

USER: ORD and DTW are my airport codes.

ASSISTANT: Do you have any preference?

USER: No.

ASSISTANT: Connecting flight can be booked with American airlines for price 100. Shall I book a ticket?

USER: Yes, please book.

ASSISTANT: Your ticket is booked having flight number 1002 which departs at 19:00 hours and arrives at 10:00 hours.

USER: Thank you.

ASSISTANT: Thanks.