You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Jonathan Campbell.

ASSISTANT: How can I assist you at this moment?

USER: I want to change my existing reservation, due to examination schedule postponed. Can you please help me?

ASSISTANT: Sure, I am here to help you. Please give me a moment to check your reservation status.

USER: Sure, take your own time.

ASSISTANT: Jonathan Campbell, I have found your reservation. Can you please provide your airport codes of journey?

USER: My airport codes are DTW and SFO.

ASSISTANT: May I know your planned dates of journey please?

USER: My itinerary dates are June 13 and June 15.

ASSISTANT: Do you have any specification for this trip?

USER: My return time is afternoon and class preference is economy.

ASSISTANT: Hawaiian airlines is providing connecting flight on this route with a ticket fare of 200, shall I book your ticket?

USER: Ok, please confirm the booking.

ASSISTANT: Jonathan Campbell, your ticket is booked in economy class of flight number 1017.

USER: Thank you for your help.

ASSISTANT: Thank you and have a safe journey.