You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I assist you for the day?

USER: I want to do some changes in my existing reservation. Can you help me for that?

ASSISTANT: Sure, I am here to help you.

USER: Thank you.

ASSISTANT: May, I know your good name?

USER: My name is Frank Hall.

ASSISTANT: We found reservation on your given name. Can you help me with your new airport codes?

USER: My new travelling airport codes are EWR and MSP.

ASSISTANT: When you are willing to travel?

USER: My travelling dates are July 04 and July 06.

ASSISTANT: Do you have any connection limit?

USER: I need a direct flight in my journey.

ASSISTANT: Do you have any class preference?

USER: Any class is fine for me.

ASSISTANT: We found 1018 Frontier airlines with single connection with price 200.

USER: Ok, proceed for booking.

ASSISTANT: Your, booking has been confirmed.

USER: Thank you for booking.

ASSISTANT: Thank you for reaching us.