You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Sandra White.

ASSISTANT: How may I assist you today?

USER: Can you please help me in booking a flight ticket from Boston, BOS to reach CA-LAX?

ASSISTANT: Sure, may I know your travelling dates, please?

USER: My journey dates are from Dec 12 to Dec 14.

ASSISTANT: Do you need any specifications?

USER: My departure time is morning.

ASSISTANT: May I know your class preference.

USER: I am comfortable with any class.

ASSISTANT: Please wait a moment, let me check with your requirements.

USER: Sure.

ASSISTANT: Sorry, there are no flight tickets available on your journey dates.

USER: That's ok, not a problem.

ASSISTANT: Thank you for reaching our service.

USER: Thanks for your information.