You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I help you?

USER: Can you pleas check for the flights from Dec 21 to Dec 23.

ASSISTANT: Sure, what are your trip source and destination?

USER: My airport codes are from ORD to DFW.

ASSISTANT: Do you need any connections?

USER: Please check for 1 connecting flight.

ASSISTANT: Are there any other preferences?

USER: I will be returning in afternoon with economy class.

ASSISTANT: May I know your name?

USER: My name is Sandra King.

ASSISTANT: Sorry, there is no flight found with your details.

USER: Oh! That's fine. Thank you for checking.

ASSISTANT: Thank you for reaching us.

USER: Most welcome.