You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you today?

USER: Can you help me in booking my flight ticket from Dec 18th to Dec 20th?

ASSISTANT: Sure, please share your airport codes.

USER: My trip airport codes will be ORD to ATL.

ASSISTANT: Do you have any connection limit?

USER: I need a connecting flight.

ASSISTANT: Is there any class preference do you have?

USER: I prefer a economy class.

ASSISTANT: Do you have any airline preference?

USER: I am fine with normal cost airline.

ASSISTANT: Do you have any more requirements?

USER: No.

ASSISTANT: Please mention your name to proceed further.

USER: Cynthia Hall here.

ASSISTANT: Wait a minute please.

USER: Sure.

ASSISTANT: Sorry, there is no flight services available on your required details.

USER: Its ok, thank you.

ASSISTANT: Thank you for approaching us.