You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Robert Thomas.

ASSISTANT: How can I assist you?

USER: I am planning to visit New England Aquarium at Boston, could you please help me with booking a flight ticket from Chicago?

ASSISTANT: Sure, I'll help you in that. May I know your travel dates please?

USER: I would like to take off on 12/14 and return on 12/16.

ASSISTANT: Can you please help me with your airport codes?

USER: My source airport code is ORD and destination airport code is BOS.

ASSISTANT: Ok, please wait for a while.

USER: Sure, take your time.

ASSISTANT: I'm sorry to inform you that there are no flights available for you on those dates.

USER: That's ok, I will find an another alternate way to complete my trip. Anyways, thank you for the information.

ASSISTANT: Thank you for choosing us.