You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I assist you today?

USER: I am Jack Walker. I want to book a flight ticket to visit the Liberty Bell in Philadelphia, so please help me in booking a flight ticket.

ASSISTANT: Sure, when do you want to go to Philadelphia.

USER: I want to fly on 06/13 and return on 06/15.

ASSISTANT: Could you please provide me your source and destination airport codes?

USER: My source is Houston, TX - IAH and destination code is PA - PHL.

ASSISTANT: Ok, please wait for a moment.

USER: Sure.

ASSISTANT: Thanks for waiting, I found a Delta airline, flight number: 1007, price: 100 with one connection.

USER: You can proceed to booking.

ASSISTANT: Your flight ticket has been confirmed.

USER: Thank you.

ASSISTANT: Thank you for choosing us.