You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you?

USER: Due to earth quake, please help me in changing my existing reservation.

ASSISTANT: Ok, please wait for a minute.

USER: Sure, take your time.

ASSISTANT: May I know your name please?

USER: My name is Margaret Campbell.

ASSISTANT: Please provide me your respective airport codes.

USER: My airport codes are AUS to LAX.

ASSISTANT: Ok, when are you planning your journey?

USER: My travel dates are 06/07 and 06/09.

ASSISTANT: I found a flight in Southwest airlines with price 200. Shall I book the ticket for you?

USER: Ok, please book my ticket.

ASSISTANT: Your ticket is confirmed and the flight number is 1015.

USER: Thank you for your service.

ASSISTANT: Thank you for contacting us.