You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: Margaret Garcia here.

ASSISTANT: Garcia, how can I aid you today?

USER: Can you change my flight ticket reservation?

ASSISTANT: Sure, please wait for a while. I will check your reservation status and get back to you.

USER: Ok.

ASSISTANT: I have found your reservation, can you please tell me what change shall I make in your reservation?

USER: Take my new airport codes that is from LGA to AUS.

ASSISTANT: Ok, let me change it.

USER: My new dates for travelling would be from 08/01 to 08/03.

ASSISTANT: Ok, please wait for a while. I will change and check whether any flights available on your preferred dates.

USER: Sure.

ASSISTANT: There is a flight-1007 available in AA airlines and the ticket fare is 100 only. Is it ok for you?

USER: You can book the flight ticket.

ASSISTANT: Ok, I have changed your reservation successfully.

USER: Thank you.

ASSISTANT: Thank you for choosing us.