You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Patricia Lee.

ASSISTANT: How may I help you?

USER: I want to change my recent reservation. Can you help me out?

ASSISTANT: Ok, please wait for a moment.

USER: Ok.

ASSISTANT: May I know your travelling dates?

USER: I want to travel on 04/30 and 05/02.

ASSISTANT: What are your new airport codes?

USER: I would like to travel from HOU to IAD.

ASSISTANT: Flight-1012 is available for you with 1 connection at the price of 200. Can I book it for you?

USER: Yes, book the ticket.

ASSISTANT: Your ticket is reserved with UA airlines.

USER: Thank you for helping me out.

ASSISTANT: Thank you for reaching us.