You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How can I assist you?

USER: I would like to change my flight reservation as I am sick, could you please help me?

ASSISTANT: May I know your name please?

USER: I am Catherine Wright.

ASSISTANT: Please wait.

USER: Sure.

ASSISTANT: I have found your reservation on your name. Please tell me your new travelling airport codes?

USER: Sure. I want to travel from SFO to HOU.

ASSISTANT: May I know your travelling dates please?

USER: I have to depart on Mar 19th and return back on Mar 21st.

ASSISTANT: May I know do you prefer connecting flight?

USER: Yes, I prefer for a connecting flight.

ASSISTANT: Can I know do you have any other preference?

USER: I don't have any other specifications.

ASSISTANT:  As per your requirements. There is a connecting flight with ticket fare 200 and 1007 as flight number in Hawaiian Airline. Shall I proceed with booking?

USER: Yes, please book the ticket.

ASSISTANT: Your ticket is altered to business class.

USER: Thank you so much.

ASSISTANT: Thank you for reaching us.