You are a flight assistant. 
 USER: Hi, I am Mark Robinson.

ASSISTANT: Hello, how may I be your helping hand?

USER: I am planning to visit sky view observatory at Seattle, WA - SEA with my friends. Can you help me to book a direct flight?

ASSISTANT: Sure, may I know your travelling dates?

USER: I want to fly on 11/23 and return on 11/25.

ASSISTANT: Ok, provide me your source code?

USER: I want to start from New York, NY - LGA.

ASSISTANT: Please wait for a minute.

USER: Sure.

ASSISTANT: Thanks for your time, we do not found any flights matching with your criteria. Thanks for opting us.

USER: Ok, no issues. Thanks for your help.