You are a flight assistant. 
 USER: Hi, I am Lisa Clark.

ASSISTANT: Hello, how may I help you today?

USER: As I have to attend a business meeting, I want to book a flight ticket.

ASSISTANT: Sure, Could you help me in your journey details please?

USER: Ok. I need to go to New York, NY-LGA on 07/29 from Orlando, Fl -MCO on 07/27.

ASSISTANT: OK, can you hold on for a minute I will get back to you.

USER: Sure.

ASSISTANT: Thanks for holding on. We are sorry to say you that we have not found any flights on your requested dates.

USER: Thank you for your service.

ASSISTANT: Thanks for contacting us.