You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, How can I serve you?

USER: I am planning to visit museum of fine arts in Boston, BOS. Can you help me to book a connecting flight?

ASSISTANT: Sure, May I know the source code?

USER: My source is from Denver, DEN.

ASSISTANT: Please help me with your travelling dates.

USER: My trip dates are May 17 and 19.

ASSISTANT: Do you have any connection limit?

USER: I have already mentioned above.

ASSISTANT: Sorry, Is there any other requirements?

USER: I need an economy class.

ASSISTANT: May I know your name?

USER: Sure, Ryan Roberts.

ASSISTANT: Please wait a minute.

USER: Sure.

ASSISTANT: Sorry, No flights found with your chosen dates.

USER: Ok, thank you.

ASSISTANT: Thank you for opting us.