You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you?

USER: I need to attend my relatives marriage on dates of 09/08 and 09/10. Can you help me to find a flight?

ASSISTANT: Ok, may I know your source and destination airport codes?

USER: I want to travel from MCO to DCA.

ASSISTANT: Please wait for a moment.

USER: Sure.

ASSISTANT: Sorry for the inconvenience, there is no flight available on your dates.

USER: That's ok. Thank you for your help and valuable information.

ASSISTANT: Thank you for approaching us.