You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, do you need any help from us?

USER: I want to visit my father on his birthday. Can you book a ticket from CLT to ORD?

ASSISTANT: Sure, could you please share your departure and arrival day?

USER: My planned travel dates are 01/28 and 01/30.

ASSISTANT: Ok, could I have your name please?

USER: Sure, Amy Lee here.

ASSISTANT: Ok, do you need direct or connecting flight?

USER: I want a flight with single connection with in the economy class.

ASSISTANT: Ok, do you have any other specifications?

USER: No more, thank you.

ASSISTANT: Sorry, there is no flight with your requested class.

USER: No issues, thank you for the information.

ASSISTANT: You are welcome.