How should I reply to this facebook message?

[Ellaaa]

So, this guy I like is talking to me on Facebook, and there is flirting going on. Basically I said to him that I went on a really long tiring dog walk and that my feet hurt. and he replied 'you can walk its a miracle '

what can I say back that has a little bit of flirting in it, thank you xxx

[Nischal]

You can also joke a little bit!!
And you should comment "Yes i can walk "