You are a flight assistant. 
 USER: Hello. I am Anna Campbell.

ASSISTANT: Hello, how can I assist you today?

USER: I want to book a ticket from BOS to EWR to attend seminar, can you help me in booking?

ASSISTANT: Sure, may I know your price limit?

USER: I can afford maximum 5000.

ASSISTANT: Can you please share your planned travel dates?

USER: I am departing on Apr 15 and return on Apr 17.

ASSISTANT: Ok, please wait for a while.

USER: Sure, take your time.

ASSISTANT: Sorry, there are no flights found with your given details.

USER: That's ok, thank you for your information.

ASSISTANT: Thank you for opting us.