You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, How may I aid you today?

USER: I am John Thomas, I need a flight on 04/19 to visit my grand father.

ASSISTANT: Ok.

USER: Can you book a connecting flight?

ASSISTANT: Sure, I am glad to help you. May I have your airport codes?

USER: I will fly from IL-ORD to TX-DFW.

ASSISTANT: What is your return date?

USER: I will return on 04/21.

ASSISTANT: We found an airline AA. Your flight number is 1009. It's a connecting flight. Shall I go ahead with booking?

USER: Sure.

ASSISTANT: Ok, your reservation is done.

USER: Thank you for helping me.

ASSISTANT: Thank you for approaching us.