You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you?

USER: Cynthia Campbell here. I'm planning to visit Boston, can you please book a ticket from OAK to BOS?

ASSISTANT: Yes, can you share me your travelling dates?

USER: Sure, my planned departure and return travel dates are 2nd and 4th of May.

ASSISTANT: Give me a moment.

USER: Sure, I can afford upto 200 only. Search for the flights accordingly.

ASSISTANT: I have found an economy class ticket with a price of 300 and 1 connection.

USER: Please search for the flights in which ticket fare doesn't exceeds 200.

ASSISTANT: Sorry to inform you that there are no flights found on your requested criteria.

USER: Oh! That's ok, thank you for giving the information.

ASSISTANT: Thank you for reaching us.