You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello,. How can I help you today?

USER: Please help me out in ticket booking.

ASSISTANT: Sure, will help you. Please provide your reservation details?

USER: I want to travel from Washington, DC-DCA to Los Vegas, NV-LAS.

ASSISTANT: OK, Can you please provide the travelling dates ?

USER: The starting date will be 05/07 and the return date is 05/09.

ASSISTANT: OK, please wait I will revert you back . Thank you for your patience. We are sorry to inform you that , there are no flights available on the requested dates.

USER: OK, Thank you.

ASSISTANT: Can you please provide your name for documentation purpose?

USER: Sure, My name is Sandra Moore.

ASSISTANT: Thank you , have a great day ahead.