You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I help you?

USER: I am planning to go for BOS, so can you please help me in booking my flight ticket with 0 connection limit?

ASSISTANT: Sure, may I know your trip dates?

USER: My trip dates are 02/15 and 02/17.

ASSISTANT: Let me know your source code, please?

USER: My source code is CO-DEN.

ASSISTANT: May I know your name?

USER: Myself Helen Roberts.

ASSISTANT: Sorry, there is no flight is available for you.

USER: Ok, fine thank you for informing me.

ASSISTANT: Thank you for choosing us, have a nice day.