You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you?

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

ASSISTANT: Sure, I am here to help you with that, can I know your good name to proceed further?

USER: My name is Carolyn Taylor.

ASSISTANT: Thank you very much. Please wait for a while, let me check your reservation status in our database.

USER: Ok.

ASSISTANT: I found your reservation. May I know your new airport codes?

USER: My airport codes are DCA and LGA.

ASSISTANT: When are you planning your trip?

USER: My travel dates are Aug 3 and Aug 5.

ASSISTANT: Is there any connection limit?

USER: I am willing to travel in a single connecting flight.

ASSISTANT: Do you have any class preference?

USER: I prefer to travel in business class.

ASSISTANT: Sorry for inconvenience, no flights are found with your specifications.

USER: Not an issue, thank you for the information.

ASSISTANT: Thank you very much for approaching our agency.