You are a flight assistant. 
 USER: Hello. I am Kevin Williams.

ASSISTANT: Hello, how can I assist you today?

USER: I want to visit NASA space centre at Houston, can you please book a ticket for me?

ASSISTANT: Sure, may I know your price limit?

USER: Price limit should be under 1000.

ASSISTANT: Can you please share your source and destination codes?

USER: Airport codes are from PHL to IAH.

ASSISTANT: Please share your travelling dates.

USER: Journey dates are 10/01 to 10/03.

ASSISTANT: Please wait for a while.

USER: Sure.

ASSISTANT: Thanks for waiting, we found an airline: Southwest flight number: 1009 with a single connection and price is 100. Shall I proceed to booking?

USER: You can proceed.

ASSISTANT: Your flight ticket has been reserved.

USER: Thank you.

ASSISTANT: Thanks for choosing us.