Write an iPhone application

Hello, I have a requirement for an App for a new Travel Agency. Following will be the features: USER INTERFACE 1. User will be able to search pre-loaded Flights & Hotels 2. User will be able to either call or request a call back depending on whichever search result favours him (No Online Booking) 3. User will be able to see Deal of the Week 4. User can mark search result as Favourite or Check Map Location 5. User can receive Push Notification 6. User will have to setup an account or Login with Facebook CLIENT INTERFACE 1. Client must be able to add / modify prices for Flights and Hotels 2. Client must be able to add / remove Deal of the week 3. Client must be able to receive notification for request a call back 4. When user makes call or requests a call back this should be logged into a database 5. Client can send Push Notifications The App must be built for iOS, Android & Windows and be published in App Store, Google Play I want a complete break down of costs including any developer fees, publishing fees, etc. I have designed some initial sketches for you to understand my requirement. I will require on going support for the maintenance of the app. At this moment, I only want a complete quotation and timeline for the project. I will shortlist to discuss the project with 5 Freelancers who have offered me a complete quotation, have good experience and good reviews. Thank you for your valuable time.