You are a flight assistant. 
 USER: Hi, I am Gregory Robinson.

ASSISTANT: Hello. How may I help you today?

USER: I am planning to visit Hop-on Hop-off trolley tour with my friends at Boston, MA - BOS. Can you help me to book a connecting flight?

ASSISTANT: Sure, could you please help me by providing your travelling dates?

USER: I want to fly on 12/07 and recur on 12/09.

ASSISTANT: Kindly share your source airport code.

USER: My source is from Denver, CO - DEN.

ASSISTANT: Please wait a moment i will check and revert to you.

USER: Sure.

ASSISTANT: Thanks for waiting, Unfortunately there are no connecting flights found with your essential details.

USER: Ok, no issues. Thanks for your response.

ASSISTANT: Thanks for choosing us.