You are a flight assistant. 
 USER: Hi. I am Mary Turner.

ASSISTANT: Hello, how can I help you today?

USER: Can you check whether any flight is available on 02/01 to 02/03?

ASSISTANT: Sure, I will check with that.

USER: Ok.

ASSISTANT: May I know the takeoff and landing airport codes please?

USER: My source is DFW and destination is SEA.

ASSISTANT: Ok, please wait for while.

USER: Sure.

ASSISTANT: Sorry Mary, there is no reservation found on your requested dates.

USER: No issue, I will go with other alternative. Thank you for checking.

ASSISTANT: Thank you for approaching us, have a nice day. You are welcome.