You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I hand help to you?

USER: I would like to present a surprise gift to my friend at Washington, please help me in booking a ticket.

ASSISTANT: Yes, I am gleeful to help you. On which dates that you are planning your trip?

USER: My planned dates are from 10/27 to 10/29.

ASSISTANT: Please help me in providing your source and destination airport codes.

USER: My source and destination airport codes are LGA and DCA.

ASSISTANT: Please wait for a while to find the flight on your dates.

USER: Sure, take your time.

ASSISTANT: May I know your name for further proceeding?

USER: My name is Andrew Davis.

ASSISTANT: I am unable to find a flight in our data base on your travelling dates to reserve your flight ticket. Sorry for the inconvenience Davis.

USER: Ok, no problem. Thank you for your information.

ASSISTANT: Thank you for approaching us.