You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I help you today?

USER: Can you please assist me in booking a flight ticket from LAX to SFO?

ASSISTANT: Sure, may I know your planned travel dates?

USER: My depart will be on Apr 15th and return on Apr 17th.

ASSISTANT: May I know your connection limit?

USER: I need a single connection.

ASSISTANT: Do you have any other specifications?

USER: The depart time should be evening.

ASSISTANT: May I know your good name?

USER: Richard Martinez.

ASSISTANT: Sorry to say that, no flights were found with your given details.

USER: Ok, no worries at all. Thank you.

ASSISTANT: Thank you for reaching us.