You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, what help can I do for you?

USER: I am planning to visit Washington on 04/26 and intend to return on 04/28. Can you help me to book a flight ticket?

ASSISTANT: Sure, I am happy to help you. Can you please provide your source and destination airfield codes?

USER: Sure, I want to fly from LGA to DCA.

ASSISTANT: Please give me a moment.

USER: Ok.

ASSISTANT: Thank you for your patience, there is a direct flight available in AA airlines on your dates. Can I confirm your ticket booking?

USER: Can you please check for the flight with 1 connection?

ASSISTANT: Meanwhile, may I know your name further proceeding?

USER: Sure, my name is Ryan Adams.

ASSISTANT: I have rechecked on your request, but there is no flight found in our data base on that dates.

USER: That's fine, thank you.

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