You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I be your help at this moment?

USER: I am Sharon Lopez. I need to book a ticket from DCA to SEA, can you help me in doing that?

ASSISTANT: Sure, please provide me your planned travel dates.

USER: I am willing to travel on 04/15 to 04/17.

ASSISTANT: Do you prefer a halt between your journey?

USER: I need one halt in my journey.

ASSISTANT: Please let me know if you have any other preference.

USER: I need Business class. Please check with that.

ASSISTANT: Thank you for providing me details, sorry we don't have any flight available on given dates from you.

USER: Ok, not an issue. Thank you for the information.

ASSISTANT: Thank you for contacting us.