You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I help you?

USER: I want to change my existing reservation as my plan to visit Boston got postponed.

ASSISTANT: May I know your name?

USER: Can you help me? I am Nicholas Thompson.

ASSISTANT: Nicholas, please wait for a moment.

USER: Sure.

ASSISTANT: I found your existing reservation, could you provide your new travel dates?

USER: I would start on 04/18 and return on 04/20.

ASSISTANT: May I know your airport codes?

USER: My landing is at MA _ BOS and boarding is at Washington DC - IAD.

ASSISTANT: Please wait for a moment.

USER: Ok.

ASSISTANT: Flight 1007 of Frontier airlines is available for you.

USER: Ok, please book my ticket.

ASSISTANT: Your ticket is confirmed.

USER: Thanks for your service.

ASSISTANT: Thank you for reaching us.