You can make the changes in your Booking through your profile. Below are the steps to make the changes in your date.
Step 1: Firstly the customer has to "Login" into his profile with registered email ID or phone number and click on "My Bookings"
Step 2: Select the booking for which you want to make the changes in the "Upcoming" queue.
Step 3: Click on "Change Flight".
Step 4: In the next page you will get the details of your booking. You have to select the "New Travel Date" and click on "Reschedule"
Step 5: In the next page you will get different options of the flight. Select the preferable flight as per your convenience.
Step 6: In the next page you will get the details of your new flight and fare breakup. Check the details and click on "Book Now" 
Step 7 : In the next step you will get the confirmation message on your email ID, phone number and WhatsApppp along with the new ticket copy.
