You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I assist you today?

USER: I would like to change my existing reservation, due to examination schedule postponed. Can you please help me?

ASSISTANT: Sure, may I know your name please?

USER: My name is Robert Davis.

ASSISTANT: We found a reservation with your given name, please share your new journey dates.

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

ASSISTANT: May I know your source and destination airport codes?

USER: My airport codes are AUS and CLT.

ASSISTANT: Do you want connecting flight or direct flight?

USER: I need a connecting flight.

ASSISTANT: Do you have any airline preference?

USER: No.

ASSISTANT: Do you want business class or economy class?

USER: I am comfortable to travel in any class.

ASSISTANT: Do you have any other requirements?

USER: No.

ASSISTANT: We found a Hawaiian airline, flight number: 1021, price: 100 with one connection.

USER: Ok, please book.

ASSISTANT: Your flight ticket has been confirmed in economy class.

USER: Thank you for your help.

ASSISTANT: Thank you for choosing us.