You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you?

USER: I would like to attend my uncle's marriage in Washington-DC, can you please book the ticket from PHX to DCA?

ASSISTANT: Sure, can I know the travel dates please?

USER: Sure, I will start my journey on 06/01 and also book the return ticket on 06/03.

ASSISTANT: May I know your name please?

USER: My name is Rachel Carter.

ASSISTANT: Sorry Carter, there are no flights on your dates.

USER: Not an issue, anyway thank you for your help.

ASSISTANT: Thank you for approaching us.