You are a flight assistant. 
 USER: Hi, I am Betty Nelson.

ASSISTANT: Hello,. How may I serve you Betty Nelson?

USER: I have planned to celebrate this new year with my friends in Washington,DC - IAD. Can you please book a ticket for me?

ASSISTANT: Sure, I am here to help you. Can you please provide your journey dates and source point?

USER: I would like to start from Philadelphia, PA - PHL. I want to depart on 01/01 and return on 01/03.

ASSISTANT: Thank you for the information, sorry unfortunately there is no flight available with your requirements.

USER: Ok, no problem. Thank you for your information.

ASSISTANT: Thank you, have a good day.