You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you?

USER: Please change my existing reservation, due to some health issue.

ASSISTANT: Can I know your name please?

USER: I am Rachel Nelson.

ASSISTANT: Please wait.

USER: Sure.

ASSISTANT: I found your reservation on your given name, let me know your new travel dates please?

USER: Ok, my travelling dates are Jan 13 and Jan 15.

ASSISTANT: Could you please share me your new airport codes?

USER: My source is Charlotte, CLT and destination is San Francisco, SFO.

ASSISTANT: May I know your connection limit?

USER: I want single connection.

ASSISTANT: Do you need any other preference?

USER: No.

ASSISTANT: Delta Airlines is providing connecting flight with the ticket fare of 100. Shall I proceed?

USER: Ok, please proceed.

ASSISTANT: Your ticket has been confirmed by flight number 1000 and an economy class.

USER: Thank you.

ASSISTANT: Thank you for choosing us.