You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I aid you?

USER: I would like to change my existing reservation due to some issues.Can you help me in this?

ASSISTANT: Sure, I am here to help you.

USER: Thank you.

ASSISTANT: May I know your name to check your previous reservation status?

USER: I am Justin Campbell.

ASSISTANT: Ok, please give me a moment.

USER: Sure.

ASSISTANT: We are happy to inform you, we found an active reservation on your name. Please share your airport codes.

USER: My airport codes are DFW - OAK.

ASSISTANT: Can you please share your travelling dates?

USER: My trip dates are 04/26 - 04/28.

ASSISTANT: Do you have any connection limit?

USER: I need a single connection.

ASSISTANT: May I know your class preference?

USER: I need an economy class and want to return in the evening time.

ASSISTANT: Do you have any other requirements?

USER: No, thank you for asking.

ASSISTANT: Ok, please be on hold.

USER: Sure.

ASSISTANT: We found a flight from Spirit airlines with a ticket fare 300, which departs at 10:00 AM and return at 23:00 PM, shall I proceed with booking?

USER: Please reserve.

ASSISTANT: Your ticket is confirmed with the flight-1013 in economy class.

USER: Thank you.

ASSISTANT: Welcome, have a safe trip.