Provide a clear example of a similar job you have done in the past.
I am not sure, if I can show you 100% similar website but can I show you some websites, where you can find similar features?
Proposal:
Dear Sir,
I have read your project description & understood the initial high level requirements. This initial message is just to confirm you that we can do this project, so please initiate the chat to finalize the contract details, estimate, payment terms etc. but just so you know, I am flexible in prices, as quality comes first for me and then prices.
Do you also want iPhone & Android Apps?
Look forward to hearing from you & start further discussion thru' private chat.
Regards,
YK
LEADconcept