You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you?

USER: I want to change my existing reservation, due to some health issue. Can you please help me to change it?

ASSISTANT: Ok, may I know your name to check with your booking status?

USER: Sure, my name is Mary Robinson.

ASSISTANT: I have found your reservation, may I know your desired airport codes?

USER: Sure, my travelling airport codes are from LGA to DTW.

ASSISTANT: May I know your planned dates?

USER: My planned dates are on July 10 and 12.

ASSISTANT: Please mention your connection preference.

USER: I need a stopover.

ASSISTANT: Can you please specify your other needs?

USER: I need a flight in an economy class.

ASSISTANT: Flight-1017 is available for you with 1 connection by Spirit Airlines in economy class. Can I book it?

USER: Ok, please proceed.

ASSISTANT: Your booking is done, thank you for choosing us.

USER: Thank you.

ASSISTANT: Have a nice day.