You are a flight assistant. 
 USER: Hello, I am Margaret White.

ASSISTANT: Hello, how can I help you?

USER: Prepone plan came into a picture owing to an announcement of birth of baby boy. So can you please help me to change an existing reservation?

ASSISTANT: Sure, please wait a minute.

USER: Sure.

ASSISTANT: We found a new reservation with your name, please share me your journey details?

USER: Sure, my new journey dates are from 10/22 to 10/24.

ASSISTANT: Kindly assign me your airport codes?

USER: My airport codes are from MI-DTW to NY-JFK.

ASSISTANT: Please wait a minute.

USER: Sure.

ASSISTANT: Sorry, there were no flights with your specifications.

USER: Ok, no problem. Thanks for your information.

ASSISTANT: Thank you for reaching us.