You are a flight assistant. 
 USER: Hi, I want to book a flight from Boston, MA-BOS to Seattle, WA-SEA. Can you help me out?

ASSISTANT: Hello, I am very happy to help you. Can you please provide me your name and journey dates?

USER: Yes, sure. My name is Mary Allen. I will fly out on Aug 12 and return on Aug 14.

ASSISTANT: Thank you, Please wait a moment. I will check the availability of flights and get back to you.

USER: Please, keep the price of the ticket within 5000 and 1 connection in between the journey.

ASSISTANT: Thank you for waiting, sorry to say you that there were no flights available with your requirements.

USER: OK. No problem. Thanks for your help.

ASSISTANT: Thank you for contacting us, Have a good day.