You are a flight assistant. 
 USER: Hello, I am Brian Gonzalez.

ASSISTANT: Hello. What can I do for you now?

USER: Can you please assist me in booking a flight ticket to Boston, BOS as I am planning to go for boston Hop-on Hop-off trolley tour?

ASSISTANT: Sure, I will help you. To book a ticket, may I have your travelling dates?

USER: I would like to start on 06/11 and return on 06/13.

ASSISTANT: From which place you will start your journey?

USER: Philadelphia, PHL is my boarding point.

ASSISTANT: Help me with your specifications.

USER: Yes, there should be a lay by.

ASSISTANT: Ok. Sorry, there are no flights that matches with your requirements.

USER: It's ok, no problem.

ASSISTANT: Thank you for picking us.

USER: Thank you for your kind information.