You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: Mary Parker here.

ASSISTANT: How can I aid you?

USER: Can you please help me out in changing my recent reservation? As my visiting location is completely destroyed by floods.

ASSISTANT: Sure, I will help you with that.

USER: Ok.

ASSISTANT: Mary Parker, I found your previous reservation under your name. Can you please share me your new airport codes please?

USER: Sure, my source and destination airport codes are LGA and ATL.

ASSISTANT: May I know your journey dates please?

USER: I want to depart from here on 01/08 and return by 01/10.

ASSISTANT: Mary Parker, there are no flights available in your route.

USER: That's ok, thank you for giving the information.

ASSISTANT: Thank you for reaching us.