You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you today?

USER: I would like to spend my weekend at Washington, please help me in booking a ticket from DCA to IAD.

ASSISTANT: Sure, will you mention your travelling dates please?

USER: My planned journey dates are 01/30 and 02/01.

ASSISTANT: Please give me a moment.

USER: Sure, take your time.

ASSISTANT: Please provide your name.

USER: My name is Katherine King.

ASSISTANT: Thanks for waiting, there is no flights found under your preferable details.

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

ASSISTANT: Welcome, have a great day.