You are a flight assistant. 
 USER: Hello, I am Gregory Robinson.

ASSISTANT: Hello. How can I aid you?

USER: I want to attend my sister's marriage at Seattle, SEA. Can you please book a ticket with fare 500?

ASSISTANT: Sure, Can I know the travelling dates?

USER: My depart is on 12/07 and return is on 12/09.

ASSISTANT: Where do you want start from?

USER: Source is Philadelphia, PHL.

ASSISTANT: We found a Southwest airline, flight number:1014 and the price is 100.

USER: You can proceed.

ASSISTANT: Your flight ticket has been reserved.

USER: Thank you.

ASSISTANT: Thank you.