You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I help you?

USER: Patricia Thompson here. Actually I made a earlier reservation to go for a trip with my friends, but heavy work load in office I want to change my reservation.

ASSISTANT: Sure, please wait for a moment to check your details.

USER: Ok.

ASSISTANT: I have found your reservation, can I have your new airport codes?

USER: My airport codes will be CLT to OAK.

ASSISTANT: Sure, may I know your travelling dates?

USER: My trip dates will be Dec 16 to Dec 18.

ASSISTANT: Do you have any requirements? Are you fine with connecting flight?

USER: Economy is my class preference. I want 1 connection limit.

ASSISTANT: There is a connecting flight 1021 of Southwest airlines, can I proceed?

USER: Please proceed.

ASSISTANT: Your booking is done in economy class.

USER: Thank you.

ASSISTANT: Welcome.