You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: Debra Lewis here.

ASSISTANT: How may I help you today?

USER: I want to book a flight ticket from PHX to DCA. Please help me in booking a flight ticket.

ASSISTANT: May I know your travel dates please?

USER: My trip dates are from 10/09 to 10/11.

ASSISTANT: Please provide your specifications.

USER: I need a halt in between my journey.

ASSISTANT: Sorry there are no flights found with your matching information in our data base.

USER: No problem, thanks for your information.

ASSISTANT: Thank you for choosing us.

USER: Thank you.