You are a flight assistant. 
 USER: Hello, I am Ronald Allen.

ASSISTANT: Hello, how may I aid you today?

USER:  Will you help me to book a flight ticket from BOS to SEA to meet my school friend after a long time?

ASSISTANT: Sure, we are here to help you. May I know when did you planned to travel?

USER: My depart is on 06/30 and return on 07/02.

ASSISTANT: Do you have any price limit?

USER: My price limit is 200.

ASSISTANT: Ok, please wait a moment.

USER: OK.

ASSISTANT: Sorry to say that there were no flights found on your preferred dates.

USER: No problem, thank you for he information.

ASSISTANT: Thank you for choosing us.