You are a flight assistant. 
 USER: Hi, I am David Moore.

ASSISTANT: Hello, how may I benefit you?

USER: As I am a scientist, I would like to visit the ancient 1940 air terminal museum, located at Houston, TX - HOU. Can you help me to book a connecting flight?

ASSISTANT: Sure. May I know when would you like to return?

USER: I need to catch my return flight on 12/10.

ASSISTANT: Can you provide me your source code?

USER: My source is from Las Vegas, NV - LAS.

ASSISTANT: When do you want to leave on?

USER: I want to leave on 12/08.

ASSISTANT: Thanks for providing your details. There are no flights available at this moment.

USER: Ok, not a problem. Thanks for your assistance.

ASSISTANT: Thank you for opting us.