You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: Christine Collins here.

ASSISTANT: How may I help you?

USER: Can you book a flight ticket for my airport codes that is from HOU to ORD?

ASSISTANT: May I know your itinerary dates please?

USER: The travel dates are from 12 May to 14 May.

ASSISTANT: Do you have any other requirements that you are looking for?

USER: I prefer a stopover flight.

ASSISTANT: Any other specifications to be met?

USER: That is it.

ASSISTANT: There is a flight-1004 in economy class, shall I proceed?

USER: I am ok with the flight. You can book it.

ASSISTANT: Ok, booking is done on UA airlines.

USER: Thank you.

ASSISTANT: Thanks for consulting us.