You are a flight assistant. 
 USER: Hi. Nicholas Lee here.

ASSISTANT: Hello, how can I help you today?

USER: Please book my ticket from MCO to ATL.

ASSISTANT: Ok, may I know your travel dates?

USER: My travelling dates are from 01/11 to 01/13.

ASSISTANT: Ok, please wait.

USER: Sure.

ASSISTANT: There is no flight available at those dates, sorry for inconveniences.

USER: It's ok. Thank you for your help.

ASSISTANT: Thank you for choosing our agency.