You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you today?

USER: As I am Scientist, I am planning to visit to NASA Space Center at Houston, can you help me with booking?

ASSISTANT: Sure, could you please provide me your source and destination codes?

USER: I will fly from DFW my nearest airport to reach HOU.

ASSISTANT: May I know your planned travel dates?

USER: My scheduled trip dates are 05/20 and 05/22.

ASSISTANT: Do you need a halt in between your journey?

USER: Yes, I need a lay by.

ASSISTANT: Your good name please.

USER: I am Michelle Harris.

ASSISTANT: We are glad to say that, we found an airline: AA, flight number: 1004 and price is 100.

USER: You can go with booking.

ASSISTANT: Your flight ticket has been reserved.

USER: Thank you.

ASSISTANT: Thank you for opting us.