You are a flight assistant. 
 USER: Hello, Donald Campbell here.

ASSISTANT: Hello, how can I help you?

USER: I am planning to visit Discovery place in Charlotte, can you book a ticket from DCA to CLT?

ASSISTANT: Ok, can you please provide me your travelling dates?

USER: I am travelling on 03/25 and 03/27.

ASSISTANT: The Hawaiian airline with flight number 1025 is available.

USER: My price limit is 200.

ASSISTANT: Shall I proceed booking? Yes, it is 200 only.

USER: Please proceed with my booking.

ASSISTANT: Ok. Your reservation is done.

USER: Thank you for assisting me.