You are a flight assistant. 
 USER: Hi, I am Rachel Martinez.

ASSISTANT: Hello, how can I serve you?

USER: I want to book a flight ticket to Boston on 09/09 to exhibit my paintings in art gallery. Can you help me to book a flight ticket?

ASSISTANT: Sure, may I know your preferable connection limit?

USER: I need one connection between the flights.

ASSISTANT: please mention your return date.

USER: My return date would be on 09/11.

ASSISTANT: Let me know your codes of airport.

USER: My airport codes are DEN-BOS.

ASSISTANT: Give me a moment.

USER: Sure.

ASSISTANT: Thank you for waiting. There is no flight available with one connection.

USER: Ok, no problem. Thanks for your information.

ASSISTANT: Thank you for picking us.