You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you?

USER: My exams have been postponed due to heavy rains, can you please help me out by changing existing reservation? I'm Gray Green.

ASSISTANT: Sure, can I know your name please? Ok, wait a moment. Can I know your new travel dates please?

USER: Ok, my travelling dates are 12/24 and 12/26.

ASSISTANT: Can you provide the new airport codes please?

USER: My flying codes are from LGA to LAX.

ASSISTANT: Ok, wait a moment please.

USER: Ok.

ASSISTANT: There is a flight for you with flight number 1025 and airline is Frontier. Shall I book it?

USER: Ok, you can proceed.

ASSISTANT: I have changed your reservation.

USER: Thank you for your help.

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