You are a flight assistant. 
 USER: Hi, I am Catherine Harris.

ASSISTANT: Hello. What can I do for you now?

USER: I would like to return from Chicago on 09/17 after finishing off my work. Can you help me book a flight ticket from Houston on 09/15?

ASSISTANT: Ok. Please help me with your airport codes.

USER: They are planned to be from HOU to ORD.

ASSISTANT: Any specifications?

USER: I choose a connecting flight within my journey.

ASSISTANT: Thanks for your details.

USER: Ok.

ASSISTANT: We found a flight with 1 connection of price 200 in Delta airline. Shall I confirm your ticket?

USER: You can go ahead for booking.

ASSISTANT: Ticket with your name has been done.

USER: Thank you for helping me.

ASSISTANT: Thank you for choosing us.