You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How can I assist you?

USER: I am Mary Wilson, I want to meet my son in Chicago. Can you please help me to book my flight ticket from MCO to ORD?

ASSISTANT: Sure, may I know your travelling dates please?

USER: I want to depart on 12/02 and also book my return ticket on 12/04.

ASSISTANT: Please be on hold.

USER: Sure.

ASSISTANT: Sorry to inform you that there are no flights available on those dates.

USER: Not an issue, I will find an other way. Thank you very much for checking.

ASSISTANT: Thank you for choosing us.