You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I support you?

USER: I am Kenneth Roberts want to book a flight ticket from Chicago to Houston on 04/28 and return on 04/30, can you help me with it please?

ASSISTANT: Sure, I will help you. May I know your source and destination airport codes?

USER: Yes, my airport codes are IL-ORD and TX-HOU.

ASSISTANT: Do you have any other specifications?

USER: Yes, I need a connection in between the journey.

ASSISTANT: Sorry to inform that no flights are available with single connection.

USER: That's ok, thank you for the information.

ASSISTANT: Thanks for opting us.