You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you?

USER: I would like to travel from BOS to DFW on a weekend event. Can you help me in booking a ticket?

ASSISTANT: Ok, please tell your travelling dates?

USER: I am planning to travel on dates 05/20 and 05/22.

ASSISTANT: May I know your name please?

USER: My name is Michelle Lewis.

ASSISTANT: Sorry, there are no flights available with your request.

USER: That's fine. Thank you for your information.

ASSISTANT: Thank you and have a nice day.