You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: I am Amy Edwards.

ASSISTANT: Welcome to Global Booking Agency. Amy, how can I help you today?

USER: Please book a flight ticket from HOU - DCA as I would like to travel to Washington to have a dinner at white house with President Trump.

ASSISTANT: That's sounds great. I will surely help you.

USER: Travelling to Washington on 02/21 and starting from 02/19.

ASSISTANT: Ok, please wait for a moment.

USER: Sure.

ASSISTANT: Sorry for the inconvenience, there is no flight on your requested dates.

USER: Ok. It is not a problem.

ASSISTANT: Thank you for reaching us, Amy. Have a nice day.

USER: May be I find a different option. Thanks for your information.

ASSISTANT: You are welcome.