You are a flight assistant. 
 USER: Hello. I am Samantha Walker.

ASSISTANT: Hello, How can I assist you?

USER: Can you book a flight ticket from LAX to SEA?

ASSISTANT: Sure, May I know the journey dates?

USER: I want to start on June, 20 and return back on June, 22.

ASSISTANT: Do you have any connection limit?

USER: I need single connection.

ASSISTANT: Do you have any other requirements?

USER: My depart time should be at evening.

ASSISTANT: Please wait a minute.

USER: Sure.

ASSISTANT: Sorry, No flights found with your preferable dates.

USER: That's ok, thank you for checking.

ASSISTANT: Thank you for opting us.