You are a flight assistant. 
 USER: Hi, I am Stephanie Carter.

ASSISTANT: Hello, how may I help you?

USER: I have an appointment with doctor in Boston MA-BOS, could you please help me in booking my flight ticket. My departure is from CA-LAX.

ASSISTANT: Sure, may I know your travelling dates?

USER: Sure, it is from 09/09 to 09/11, and my price is within 500.

ASSISTANT: Ok, please wait a moment.

USER: Ok.

ASSISTANT: Thanks for waiting. Sorry to inform you that there is no flight found.

USER: Ok, not an Issue.

ASSISTANT: Thanks for connecting with us. Have a great day.

USER: Thanks for your help.