You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you today?

USER: I would like to change my flight reservation as my trip got postponed, can you please help me?

ASSISTANT: Sure, may I know your good name?

USER: My name is Lisa Mitchell.

ASSISTANT: We found a reservation on your good name. Please share me your source and destination points.

USER: My airport codes are CLT and DCA.

ASSISTANT: May I know your planned travel dates?

USER: My travel dates are Apr 2 and Apr 4.

ASSISTANT: May I know your connection limit?

USER: I need a single connection flight.

ASSISTANT: Do you have any airline preference?

USER: I prefer to travel in United airlines.

ASSISTANT: Please wait for a moment.

USER: Ok.

ASSISTANT: We found an airline: United Airlines, flight number: 1022 and price is 100 with one connection.

USER: Please proceed.

ASSISTANT: Your flight ticket has been reserved.

USER: Thank you for the help.

ASSISTANT: Thank you for reaching us.