Here is the Contact Form 7 template and source code for the Contact form.
To edit this form go to Contact> then edit your targeted form
<div class="row">
<div class="col-lg-6 col-sm-6">
<div class="form-group">
[text* name class:form-control placeholder "Name"]
</div>
</div>
<div class="col-lg-6 col-sm-6">
<div class="form-group">
[email* email class:form-control placeholder "Email"]
</div>
</div>
<div class="col-lg-6 col-sm-6">
<div class="form-group">
[text* phone_number class:form-control placeholder "Phone"]
</div>
</div>
<div class="col-lg-6 col-sm-6">
<div class="form-group">
[text* msg_subject class:form-control placeholder "Your Subject"]
</div>
</div>
<div class="col-lg-12 col-md-12">
<div class="form-group">
[textarea* message class:form-control placeholder "Your Message"]
</div>
</div>
<div class="col-lg-12 col-md-12">
<button type="submit" class="default-btn">Send Message</button>
</div>
</div>