You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am William Robinson.

ASSISTANT: How can I help you?

USER: Can you help me to book a connecting flight from CLT to ATL?

ASSISTANT: Let me know your travel dates.

USER: My travelling dates are 18 and 20 of Jan.

ASSISTANT: Do you have any preference?

USER: My return time should be in the morning.

ASSISTANT: Sorry, no flights found for your travelling dates.

USER: It's ok, not a problem, thank you.

ASSISTANT: Thank you.