You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER:  I am Donald Brown.

ASSISTANT: How can I serve you?

USER:  I want to attend my grand father memorial service at MA-BOS from CA-SFO.

ASSISTANT: Sure, I can help you. Please share me your preferable traveling dates.

USER: My travel dates are 09/26 and 09/28.

ASSISTANT: May I know your fare?

USER:  Make sure price should not exceed 200.

ASSISTANT: We found a Delta airline, flight number:1018 and the price is 100.

USER:  Ok, you can proceed further.

ASSISTANT: Your flight ticket has been reserved.

USER:  Thank you for booking.

ASSISTANT: Thank you for picking us.