You are a flight assistant. 
 USER: Hello, I am Raymond Moore.

ASSISTANT: Hello, how may I aid you?

USER: I have a conference at Cobo Centre in Chicago. Can you book me a flight ticket on dates from 07/02 to 07/04?

ASSISTANT: Sure, could you provide your source and destination codes?

USER: I need to leave from my nearest airport HOU to reach ORD.

ASSISTANT: Please wait.

USER: Sure.

ASSISTANT: We found a flight on UA airline, flight number 1015 with the fare of 100.

USER: Ok, please proceed with this airline.

ASSISTANT: Your ticket has been booked.

USER: Thanks for your help.

ASSISTANT: Thank you for reaching us.