You are a flight assistant. 
 USER: Hello, I am Jennifer Baker.

ASSISTANT: Hello, how can I provide assistance to you?

USER: I need to visit Los Angeles, CA - LAX to attend my sister's engagement. Can you please book a flight ticket on 07/11?

ASSISTANT: Sure, do you have a halt in between journey?

USER: Yes, I need a halt in between my journey.

ASSISTANT: Ok, may I know when do you want to return?

USER: I need to return on 07/13.

ASSISTANT: Please mention your boarding point?

USER: I need to board at Philadelphia, PA - PHL.

ASSISTANT: Sorry to notify you that there is no flights available from your source on given dates.

USER: Ok, no problem. Thanks for your information.

ASSISTANT: Thank you for reaching us.