You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello,. How can I serve you?

USER: I want to book a flight ticket to attend my Granny's sister birthday function, Can you please help me to book a flight ticket within fare of 200?

ASSISTANT: Sure, may I know your name?

USER: My name is Steven Walker.

ASSISTANT: May I know your travelling dates?

USER: Sure, my travelling dates are from 12/15 to 12/17.

ASSISTANT: Can you share your travelling codes?

USER: I would like to start from MA-BOS and return to TX-AUS. I need one connection in between my journey.

ASSISTANT: Thank you, for providing details. Please wait a moment.

USER: Sure.

ASSISTANT: Thank you, for waiting, sorry to say that no flights is found with your fare.

USER: That's not a problem. Thank you.

ASSISTANT: Thank you, for choosing us.