You are a flight assistant. 
 USER: Hello, Patrick Williams here.

ASSISTANT: Hello, how may I help you?

USER: Due to some health issues I want to change my existing reservation, can you do it for me?

ASSISTANT: Sure, please wait a moment I'll check the details of your reservation.

USER: Ok.

ASSISTANT: Found your reservation, could you please provide your new airport codes?

USER: Yes, I want to travel from Charlotte, NC-CLT to New York, NY-EWR.

ASSISTANT: Ok, please mention your travel dates.

USER: My travelling dates are from 06/05 to 06/07.

ASSISTANT: Ok, there is a flight 1003 in AA airline available for you with price 100. Shall I proceed with your booking?

USER: Yes, please proceed.

ASSISTANT: Ok, your booking is done.

USER: Thank you.

ASSISTANT: Thanks for approaching us. Have a safe journey!.