You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you today?

USER: I would like to visit Ro Ho En garden at Phoenix, I want to book a ticket from DCA to PHX.

ASSISTANT: Can you please share on what dates you are willing to travel?

USER: I want to travel on 01/15 and return on 01/17.

ASSISTANT: For proceed your booking, can I know on which name you want to book a ticket?

USER: Sure, my name is Barbara Anderson.

ASSISTANT: Sorry, there is no flight available at your request.

USER: Ok, no problem.

ASSISTANT: Thank you for reaching us.

USER: Thank you for your information.