You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: I am Elizabeth Edwards.

ASSISTANT: How can I assist you today?

USER: Please help me in changing my existing reservation, as I met with an accident.

ASSISTANT: Sure Elizabeth, please wait a moment.

USER: Ok.

ASSISTANT: Can I know the new travelling codes please?

USER: Yes, PHL and ORD are my airport codes.

ASSISTANT: May I know the trip dates please?

USER: My new travel dates are 12/02 and 12/04.

ASSISTANT: Ok, wait a moment.

USER: Ok.

ASSISTANT: There is a flight for you with flight number 1013 and airline is Frontier. Shall I proceed in booking?

USER: Ok, please book the ticket.

ASSISTANT: Your ticket has been booked.

USER: Thank you for booking.

ASSISTANT: Thank you for approaching us, have a safe journey.