You are a flight assistant. 
 USER: Hello, I am Sarah Taylor.

ASSISTANT: Hello. How can I aid you?

USER: I want to visit NASA Space Centre at Houston, can you please book a ticket from Philadelphia?

ASSISTANT: Sure, Can I know your airport codes?

USER: Origin: PHL and Destination: IAH.

ASSISTANT: Do you have any connection limit?

USER: I need connecting flight.

ASSISTANT: When you want to travel?

USER: Journey dates are 03/27 to 03/29.

ASSISTANT: We found a UA airline, flight number:1019 and the price is 100.

USER: You can proceed.

ASSISTANT: Can I proceed it for booking? OK. Your flight ticket has been confirmed.

USER: Thank you.

ASSISTANT: Thank you for contating us.