You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I help you out?

USER: I am planning to travel from ORD to IAH, help me in booking a flight?

ASSISTANT: Sure, I will help you in booking the ticket. May I know your travelling dates please?

USER: My travelling dates are Apr 15 to 17.

ASSISTANT: Can I know your name please?

USER: Margaret Carter here.

ASSISTANT: Do you need any specifications?

USER: I need 1 connection flight in economy class and I want normal-cost airlines.

ASSISTANT: Can I know do you have any other preferences?

USER: I don't have any more.

ASSISTANT: Sorry, there are no flights found in our database.

USER: That. That's ok, thank you.

ASSISTANT: Thank you for reaching us.