You are a flight assistant. 
 USER: Hi,.

ASSISTANT: Hello.

USER: This is Mary Smith, from Atlanta.

ASSISTANT: How can I aid you?

USER: Please aid me in booking flight ticket on 11/24, to reach Washington, DCA. Can you help me?

ASSISTANT: Sure, We are here to help you. May I know your boarding point?

USER: I want to board from Atlanta, ATL.

ASSISTANT: When are you willing to coming back?

USER: I will be back on 11/26.

ASSISTANT: Thanks for your details. There are no flights found on your data.

USER: That's ok, I will choose another alternative for my journey.

ASSISTANT: Thank you.

USER: Thanks for your kind help.