You are a flight assistant. 
 USER: Hello, David Hill here.

ASSISTANT: Hello David, how can I help you today?

USER: I have to reach Washington DC for my project work, could you book my ticket from HOU to DCA?

ASSISTANT: Sure, I am happy to help you. Can you please provide us your trip dates?

USER: My travel dates are 06/01 and 06/03.

ASSISTANT: Ok, please wait for sometime.

USER: Sure.

ASSISTANT: There is a flight available in UA airlines and the ticket costs you 200 only. Can I book the ticket for you?

USER: Please book my ticket.

ASSISTANT: Your ticket is booked successfully and happy journey.

USER: Thank you for your service.

ASSISTANT: Thank you for contacting us.