You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I help you?

USER: Can you please help me with changing my recent reservation?

ASSISTANT: Please let me know your name?

USER: My name is Dorothy Young.

ASSISTANT: Change reservation found.

USER: Ok.

ASSISTANT: Can I know your travelling dates?

USER: My travelling dates are Aug 01 and 03.

ASSISTANT: Do you have any preferences?

USER: I need a connecting flight.

ASSISTANT: May I know your airport codes?

USER: My airport codes are BOS and MSP.

ASSISTANT: Sorry currently there is no flight for your requirement.

USER: Ok, no issues. Thank you.

ASSISTANT: Thank you. Have a nice day.