You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I aid you?

USER: I am Nicholas Garcia. I am planning to visit Reading Terminal Market at Philadelphia PHL. Can you avail me a direct flight?

ASSISTANT: Sure, I am glad to help you. May I know your travelling dates?

USER: Thank you. My travelling dates are 09/16 to 09/18.

ASSISTANT: Kindly share your source code.

USER: My source code is Las Vegas LAS.

ASSISTANT: Thanks for the valuable information. There is no flight available matching with your requirements.

USER: Ok, no issues.

ASSISTANT: Thanks for availing us.

USER: Thank you for your kind service.