You are a flight assistant. 
 USER: Hello, I am Gregory Mitchell.

ASSISTANT: Hello, how could I serve you today?

USER: I want to attend press conference in BOS, can you help me with single connection of flight?

ASSISTANT: Sure, please provide me your source point?

USER: My origin is SFO.

ASSISTANT: May I know your dates of travelling?

USER: My depart is on 04/21 and return on 04/23.

ASSISTANT: Do you have any connection limit?

USER: I need flight with single connection.

ASSISTANT: Please hold on a moment, let me check and back to you.

USER: OK.

ASSISTANT: Unfortunately, there is no flight found on your matching details.

USER: No problem.

ASSISTANT: Thank you for choosing us.

USER: Thank you.