You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: Margaret Allen here.

ASSISTANT: How can I help you Allen?

USER: I am very excited to say, that my friends has planned a weekend tour to Los Angeles to visit  Hollywood Boulevard.

ASSISTANT: Ok, can you tell me your journey dates?

USER: Please help me in booking the ticket from 11/27 to 11/29.

ASSISTANT: Airport codes?

USER: My source and destination codes are OAK to LAX.

ASSISTANT: Sorry to inform you that, no flights are currently available for you.

USER: Ok, no issues. Thank you for your help.

ASSISTANT: We will inform you if there is availability.

USER: Ok, thanks for your concern.

ASSISTANT: Have a nice day, thanks for choosing us.