@gaurav.tiwari - simply format the string in your process as you’d like it to appear in the chat response, and then assign it to the output argument that’s in the Dialogflow intent response.
The discount code fulfilment and order status fulfilment processes in this retail sample provide examples of this
Anil_G
ashokkarale
jinal.shah
Gautham_Pattabiraman
postwick
chandreshsinh.jadeja
vrdabberu
Ajay_Mishra
sven.wullum1
Vyshnavi_Nalumachu