You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I amend you today?

USER: I want to book a flight ticket to Phoenix with price under 200. Can you please help me with it?

ASSISTANT: Sure, can you please provide your planned dates of travelling?

USER: Travelling dates are 12/13 and 12/15.

ASSISTANT: Can you please help me with your airport codes?

USER: Airport codes are DCA-PHX.

ASSISTANT: May I know your good name please?

USER: My name is Daniel Rodriguez.

ASSISTANT: Ok, please wait for a while.

USER: Ok.

ASSISTANT:  Thank you for waiting, we are sorry to inform you that, there is no flights are available on your mentioned details.

USER: Ok, no issues.

ASSISTANT: Thank you for reaching us. Have a good day.

USER: Thanks for the help.