You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I aid you?

USER: Samuel Green here, I need to travel Boston, can you please book flight ticket from IAD and BOS?

ASSISTANT: Yes, please I will help you with flight ticket booking. Ok, now please share your travel dates?

USER: My travelling dates are 11/16 and 11/18 and my budget is 200 limit.

ASSISTANT: Thanks for waiting. But I am sorry to say that there are no flights available.

USER: That's not an issue, I will choose any other source to travel that place.

ASSISTANT: Thank you for contacting us.