You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you?

USER: I am planning to book a ticket from BOS to DCA, can you help me?

ASSISTANT: Ok, may I know your travelling dates?

USER: I am departing on 01/24 and return on 01/26.

ASSISTANT: Ok.

USER: But I want to change my reservation.

ASSISTANT: May I know your name?

USER: My name is Jason Young.

ASSISTANT: Sorry, no reservation found by your name.

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