You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I assist you today?

USER: Charles Gonzalez here. Please help me out in booking the ticket from BOS to SFO.

ASSISTANT: Sure, let me know your travelling dates.

USER: My trip dates will be 04/07 to 04/09.

ASSISTANT: May I know your connection limit?

USER: Flight has to be with single connection.

ASSISTANT: Can you please share your depart time?

USER: My depart time must be in the evening.

ASSISTANT: Do you have any other requirements?

USER: No.

ASSISTANT: Sorry, there are no flights found with your given details.

USER: That's ok. Thank you.

ASSISTANT: Thank you for opting us.