You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I help you?

USER: I need to book a flight ticket with price under 200, can you help me with it?

ASSISTANT: Sure, I will help you. Could you please provide your journey dates?

USER: Yes, I would like to travel from 04/04 and return on 04/06.

ASSISTANT: Please provide your airport codes.

USER: I want to travel from BOS to meet my uncle at DFW.

ASSISTANT: To proceed further may I know your name?

USER: Yes, you can call me as John Hall.

ASSISTANT: We are very sorry to inform you that there is no flights found in your details.

USER: That's ok, thank you for the information.

ASSISTANT: Thanks for choosing us.