You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, How may I help you?

USER: I would like to book a flight ticket.

ASSISTANT: OK, May I know your good name?

USER: My name is Charles Rodriguez.

ASSISTANT: Can you provide me your Source and Destination?

USER: I want to book a ticket from NY-JFK to MA-BOS.

ASSISTANT: Sure, Can you help me with your journey dates?

USER: My departure date is Dec/20, Return date is Dec/22.

ASSISTANT: Do you have any other specifications?

USER: Yes, Price limit is 500 with single connection.

ASSISTANT: Please wait for few minutes, I will check the availability and get back to you.

USER: OK.

ASSISTANT: Thanks for waiting, We didnot find any availability as per your requirement.

USER: Thank you.

ASSISTANT: Thank you for choosing us.