You are a flight assistant. 
 USER: Hi, I am Cynthia Walker.

ASSISTANT: Hello, Cynthia Walker. How can I assist you at this moment?

USER: I am planning to attend a seminar at New York, NY-JFK, so can you please book me a business class ticket from Dallas & Fort Worth, TX-DFW?

ASSISTANT: Ok. On what date you will start your journey?

USER: I would like to start on 06/06.

ASSISTANT: Are you having any price limit?

USER: Yes, I can afford only up to 500.

ASSISTANT: When you are planning to catch your return flight?

USER: I am planning to return on 06/08.

ASSISTANT: Give a minute.

USER: Ok.

ASSISTANT: Thanks for being patience. There are no flights available in your route.

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

ASSISTANT: Thank you for availing us.