You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I support you today?

USER: I am Donald Walker, I have to attend meeting at Boston with share holders, can you help me to book a flight under fare of 200?

ASSISTANT: Sure, may I know your planned travel dates?

USER: I will travel on 10/31 and return on 11/02.

ASSISTANT: Please share me your source and destination codes.

USER: My source is CO-DEN and destination is MA-BOS.

ASSISTANT: Please wait for a moment.

USER: Sure.

ASSISTANT: Thanks for waiting, we found a direct flight with your given details.

USER: Sorry, I need a connecting flight on that route.

ASSISTANT: Sorry to say that, no connecting flights were available.

USER: Ok, thank you for helping me.

ASSISTANT: Thank you for opting us.